ENTOMOLOGY 951 
usual. Frontal callosity prominent and shiny black, broadly separated from the 
eyes. Thorax conspicuously marked with grayish white, the scutellum wholly white. 
Wing divided near the middle into a basal, light part with few dark markings and an 
apical, dark part with few light markings. Length, 11 to13mm........ H., ciliatipes. 
Femora and tibiae not densely fringed, the hairs at most as long as the width of the hind 
Hbige whieh: Bre mot WLOer GHAM: USUAIN 6.04 i405 ho 1d need de bs os erie y coy pa viele 
. Middle and hind tibiae uniformly colored, without paler and darker rings. Basal division 
of third antennal segment not noticeably widened............-......ceeeeeeeee 3. 
Middle and hind tibiae not uniformly colored, with paler and darker rings which are some- 
times rather faintly marked (in doubtful cases, the basal division of the third 
AMULGMMe SEaMNeMt SOMETIMES CROANCED) ia... ch ccna bade cde cen e etter nv atese ces 
3. Basal area of the wing clearer than the remainder; both basal cells either uniformly hya- 
line or subhyaline, or much more faintly mottled than the apical part............ 
Basal area of the wing not conspicuously clearer; both basal cells mottled dark and 
Hehchice tine remainder On therwiMes .25.ocicy a atace evr edl cecwdWece ba vawedule a 
4. A large hyaline area in the wing beyond the stigma, reaching the costa; stigma and dark 
area below it faint, pale yellowish. Frontal callosity dirty yellowish brown. First 
antennal segment straight, slightly and uniformly thickened throughout, longer than 
half the width of the vertex and about as long as the basal division of the third 
SCRE MG  MOmMetI. So UO" OMIM. 05.0 core cid hata Pow eee pees Wa wees H. masseyt. 
No such large hyaline area in the wing; the clear spot beyond the stigma either faint, or 
rounded and usually darkened in the center, or reduced to two small streaks; stigma 
conspicuously darkened. First antennal segment somewhat curved and more swollen 
on the inner side, at most as long as half the width of the vertex, and shorter than the 
Dasa dnvisvonror the tind seomente: 52... ate 5.-s css ae dete aes een ed oe mele 2 
5. Basal cells and discal cell distinctly, though faintly mottled dark and light, the contrast 
between the clear base and dark apex of the wing less pronounced. Frontal callosity 
shiny black, the spot between the insertions of the antennae also black. First 
antennal segment very slightly swollen, about two and one-half times as long as its 
greatest width seen from above and about the length of the terminal three divisions 
of the third segment together. Length, 9to1llmm..................... H. similis. 
Basal cells and discal cell uniformly colored, the contrast between the clear base and dark 
apex of the wing quite marked. First antennal segment more swollen, not quite twice 
as long as its greatest width seen from above and shorter than the terminal three divi- 
MOT OH bhevtnikc sepIMemh COCEHMER. dius Mavs anni Gas Fos Ses u woe sie ham aees ees 
6. Two basal cells, discal cell and proximal half of first posterior cell yellowish, somewhat 
clouded; the costal cell of the same color. Frontal callosity shiny black; a black spot 
below it, between the insertions of the antennae. Length, 9.5 to1l.smm. H. denshamiv. 
Two basal cells, discal cell and proximal half of first posterior cell almost clear hyaline; 
the costal cell conspicuously darker. Frontal callosity pale brownish to blackish; 
the median spot below it yellowish brown. Length, 9.5 to 11 mm...... H. copemanii. 
. Apical clear streak of wing bifurcate in the first submarginal cell. First antennal segment 
short, hardly longer than half the width of the vertex. Length, 6.5 to 10 mm. 
Darker species, with dark brown legs......6....¥.0c.ese ve ease eueas H. perturbans. 
Apical clear streak of the wing not bifurcate in the first submarginal cell. Lighter colored 
enecies, Wit pale yellowish-brownl I6ge.. 2.6.5 ove snk ee es cue vu su awdeescoweas 
8. Basal division of third antennal segment about one-third longer than the first segment; its 
apical division as long as or slightly longer than the preceding two divisions taken 
together. Second submarginal cell as a rule with an additional, much fainter, light 
streak in the apical portion (running from the extremity of the lower branch of the 
third longitudinal yeim). Length, 7 to LO momi..... 6. cc ca cee cee ee H. pertinens. 
Basal division of third antennal segment scarcely longer than the first segment; its apical 
division much shorter than the preceding two divisions taken together (often about 
the length of the third division). Second submarginal cell without additional streak 
at the extremity of the lower branch of the third longitudinal vein. Length, 10 to 
ROVE Sper er RItes atte Rethratie een gah 5 whe enetere met at CePA Ce EIEIO tec 1) Uris ceidite's 's ooh aig torn Hs H. duttoni. 
9. All tibiae with a narrow, indistinct, pale brown ring close to the base; middle tibiae with a 
second, pale brown, indistinct ring below the middle; basal segment of middle and 
bo 
bo 
~I 
8. 
