Hatching spines: = egg burster; q.v.
Haustellate: formed for sucking: applied chiefly to mouth structures.
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, labial 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 shell: applied to the cases of some Trichoptera.
Helocerous: with clavate antennae.