XXxii, '21] ENTOMOLOGICAL NEWS 203 



- Thorax and abdomen with bluish gray pruinescence ; hind femur with 



short weak anteroventral bristles; hind tibia with the anterodorsal 

 and preapical bristles about one-fourth as long as tibia, 



dorsorittata Malloch 



14. Hind tibia with one or two short posterodorsal setulae at middle; 

 propleural bristles very short and stout, the anterior one very con- 

 spicuously so; lower stigmatal bristle weak or absent, 



laricalti Malloch 



- Hind tibia without posterodorsal setulae ; pmplrura with a long, 



slender bristle and a fine anterior hair 15 



15. Abdomen yellow, at least at base; basal two antennal segments and 

 palpi yellow; thorax densely white pruinescent ; antennae but little 



shorter than face inidiscta Stein 



Abdomen entirely black; basal two antennal segments and palpi 

 largely or entirely black In 



16. Larger species, about 5 mm. in length; processes of fifth abdominal 

 sternite much longer than broad, armed with a few long bristles 

 and numerous long hairs; bristles on posteroventral surfaces ot 

 mid and hind femora very long and strong, extending from base to 

 apex, but very widely spaced ; basal segment of mid and hind tarsi 

 not one-third as long as tibia johnsoni Malloch 



- Smaller species, averaging about 3 mm. in length; processes of fifth 



sternite but little longer than broad, their surfaces with a few 

 setulose hairs; bristles on posteroventral surfaces of mid and hind 

 femora short and weak, confined to basal half; basal segment of 

 mid and hind tarsi more than one-third as long as tibia, 



f!u:ico.ra Stein 



17. Wings very noticeably brownish except at bases; legs very long 

 and slender, gradually darkened from near base of femora apiead. 

 the tibiae and tarsi usually almost entirely black or brownish black ; 

 thorax and abdomen densely white pruinescent, without markings. IS 



Wings clear ; legs not colored as above, either the femora with 

 clearly limited black markings apically or entirely black, or tin- 

 tibiae are pale, or the entire legs arc black except the knees; if tin 

 thorax and abdomen arc white pruinescent the latter has distinct 



paired dorsal spots except in iwpniiclata 1" 



\>'. Fnms but little longer than broad, densely silvery pruinescent; 

 orbits not clearly defined, the bristles except the anterior pair 

 very weak, sometimes absent; basal scntellar bristles very much 

 weaker than apical ari/cntnl,i t'omiillctt 



- Frons about twice as long as broad, interfrontalia fuscous, orbits 



well defined, white pruinescent. the bristles strong; basal scntellar 



bristles not much weaker than apical fns.-ifr,nis Malloch 



I 1 '. Third antennal segment with a sharp thornlike point on upper side 

 at apex; fore coxae and femora largely infuscated; lower st 



