Haustellum: a sucker: applied to that portion of the mouth of a sucking insect through which liquid food is drawn into the gullet.

Head: the first or anterior region of the insect body, articulated at its base to the thorax, bearing the mouth structures and antennae. It is now believed to be made up of seven primitive segments, named in order: 1, the ocular or protocerebral; 2, the antenna or deutocerebral; 3, second antenna or tritocerebral; 4, mandibular; 5, superlingual; 6, maxillary; 7, l.a.b.i.al or 2d maxillary.

Head vesicle: in Diptera, = ptilinum, q.v.

Heart: the dorsal vessel or tubular structure divided into chambers, lying just beneath the dorsal, which serves to propel the blood and controls the circulation.

Heautotype: = autotype; q.v.

Helcodermatus: a surface with ulcer-like depressions: applied also to the boring or tearing spines of pupae.

Heliciform: in the form of a spiral snail sh.e.l.l: applied to the cases of some Trichoptera.

Helocerous: with clavate antennae.

Helvolus: tawny or dully reddish yellow.

Helvus: honey yellow [brown pink + chrome lemon].

Hemelytra: a modification of the anterior wings of Heteroptera, coriaceous at base, membranous at tip, not meeting in a straight line at the middle: more specifically applied to the corium; q.v.: also used for the tegmina of Orthoptera.

Hemi: as a prefix, means half.

Hemimeroptera: an obsolete term for Hemiptera.

Hemimetabolous: manifesting an incomplete metamorphosis, but with a marked difference between the stages: specifically the Ephemerida, Odonata and Perlidae. {Scanner's comment: nowadays applied to far more orders, generally to those that undergo a marked metamorphosis, but without a pupal stage.}

Hemiptera: half-winged: an ordinal term applied to insects in which the mouth parts consist of four lancets inclosed in a jointed beak or rostrum; metamorphosis incomplete: the primaries may be of uniform texture throughout (h.o.m.optera) or may be thickened at base, membranous at tip (Heteroptera).

Hemispheric: like the half of a globe or sphere.

Hepaticolor: liver-brown [dragon's blood].

Hepatic pouches: applied to caeca pouches; q.v.

Herbivorous: feeding upon plant tissue: a leaf feeder.

Heremetabola: with slight or incomplete metamorphosis, but with a resting stage at the end of the nymph life; specifically the Cicadidae.

Hermaphrodite: an individual in which the characters of both s.e.xes are combined.

Hetero: as a prefix, unequal; different from.

Heterocera: Lepidoptera in which the antenna are of any form other than clubbed at tip: opposed to Rhopalocera.

Heterochrome: of different color: applied to species in which there are two color forms of one s.e.x, one of which is like (h.o.m.oeochrome), the opposite s.e.x, as in certain Odonata and Lepidoptera.

Heterochrony: an irregular development in point of time, a later stage becoming evident before one that is earlier in ordinary course.

Heterogamy: applied to those cases in which two s.e.xual or a s.e.xual and parthenogenetic generation alternate.

Heterogeneous: a mixture of different forms; abnormal.

Heterogeny: the alternation of s.e.xual and parthenogenetic generations.

Heterogyna: the ants: referring to the different kinds of females, - queens and workers, - as distinguished from males.

Heteromera: Coleopteran in which the anterior and middle tarsi are 5-jointed and the posterior are 4-jointed.

Heteromerous: having an unequal number of tarsal joints on the feet.

Heterometabola: differing among themselves in metamorphosis; but not manifesting abrupt stages.

Heteromorphous: the metamorphosis complete, in abrupt stages, the larva unlike the adult.

Heteronomous: if two parts, compared with each other, are of different quality: differing in development or function.

Heteropalpi: palpi with a different number of joints in male and female, as in some Trichoptera.

Heteroptera: an ordinal term applied to that series of Hemiptera in which the anterior wings differ in texture from the posterior, and the different regions of primaries differ in texture.

Heteropterous: with wings of different texture in different parts.

Heterotypical: a genus, described from more than one species, these differing in structure,

Hexachaetous: Diptera in which the mouth structures have six piercing setae.

Hexanephric: with six kidneys, or structures serving as such.

Hexapoda: tracheate arthropods with head, thorax and abdomen distinct, and only six legs in the adult stage: the true insects.

Hexapodal -ous: provided with six feet.

Hians: gaping.

Hibernaculum: a tent or sheath made out of a leaf or other material in which a larva hides or hibernates.

Hibernate: to pa.s.s the winter in a dormant condition.

Hicks' bottles: {Scanner's comment: sic} flask-shaped pits or depressions in the antennae of bees and ants: supposed to be the organs of hearing.

Hind angle: in primaries of Lepidoptera, is that point where inner and outer margin meet: = a.n.a.l angle of secondaries.

Hind-body: the abdomen.

Hind-gut: the intestinal ca.n.a.l from the end of chylific ventricle to the a.n.u.s, including the malpighian tubules and a.n.a.l glands.

Hind-head: Mallophaga; that part of head behind mandibles and antennae.