1927] 
New Neotropical Thysanoptera 
233 
Hercothrips gen. nov. 
(epKos, a net; Opfy, a wood worm.) 
Body reticulate, at least in head and thorax, abdomen fre- 
quently striate. Head always broader than long, with vertex 
elevated between eyes but not produced to overhang insertion of 
antennae. Eyes usually distinctly protruding, pilose. Ocelli ap- 
proximate, borne on the elevated vertex. Antennae eight-seg- 
mented, with segment 1 small, 2 much longer and broader, 3 
and 4 stem-like at either end and with forked trichomes, 6-8 close- 
ly united, 8 long and slender. Maxillary palpi two-segmented. 
Prothorax strongly transverse, shorter than head, without strong 
bristles, notum foveate. Hind coxae approximate, separated by 
a fraction only of their transverse width. Wings slender, not 
conspicuously broadened at base nor much narrowed beyond it, 
with two longitudinal veins frequently united with ambient vein; 
costal bristles and costal fringe distinct, subequal in length. Ab- 
domen not sharply constricted basally; tenth segment rarely 
divided above. 
Genotype : Heliothrips striatus Hood. 
The following species are known to belong here: aulmanni 
(Karny), bicinctus (Bagnall), brunneipennis (Bagnall), cincti - 
pennis (Hood), fasciapennis (Hinds), fasciatus (Pergande), femo- 
ralis (Reuter), indicus (Bagnall), marginipennis (Hood), rninu - 
tissimus (Bagnall), patter soni (Bagnall), phaseoli (Hood), puncti- 
pennis (Hood), sculptilis (Hood), striatopterus (Kobus), and 
striatus (Hood), in addition to the five new species described 
in this paper. 
It will be noted that Hercothrips comprises essentially those 
species which we used to place in Heliothrips , minus the genotype 
hcemorrhoidalis. In Heliothrips as now restricted, is found a some- 
what different type of wing, lacking as it does the costal fringe 
of bristles and having the anterior vein separate from the 
ambient vein through most of its length, as well as being de- 
cidedly broadened basally. In Heliothrips , too, the third and 
fourth antennal segments aye differently formed and lack the 
forked trichomes of Hercothrips, while the metascutum is more 
differentiated, with an elevated triangular central area which 
