Vol. XXVl] ENTOMOLOGICAL NEWS 21 



47 Costa with erect cilia 48 



Costa without erect cilia 49 



48 Second joint of fore tarsi shorter than any of the following joints. 



(U. S.) mundus Wied. 



Second joint longer than any following. (Mex.) . . . .hirtipcs Aid. 



49 Middle metatarsi with erect cilia above. (Mex.) ciliipcs Aid. 



Middle metatarsi not so ciliated 50 



50 Middle tibiae black 51 



Middle tibiae yellow 52 



51 All tibiae black, fore tarsi with second and third joints subequal, 



fourth and fifth longer but also subequal. (Western States.) 



pilicornis Aid. 



Fore tibiae yellow, last four joints of fore tarsi regularly decreas- 

 ing in length. (U. S., W. I.) chrysoprasius Walk. 



52 Hypopygium large, its appendages large, curved, forceps-like; 



abdomen with two long wavy bristles at tip. (Mex.) 



forcipatus Aid. 



Hypopygium small or only moderately large, abdomen without 

 long bristles at tip 53 



53 Hind tibiae and halteres yellow. (Hayti.) hirtulus Bigot 



Hind tibiae and halteres infuscated. (Mex.) purpurcus Aid. 



54 Wings with dark markings 55 



Wings wholly hyaline 63 



55 Antennae yellow. (Mex., Brazil.) basilaris Wied. 



Antennae black 56 



56 Hyaline space between the cross-bands reaching forward to the 



second vein 57 



Hyaline space not reaching beyond the third vein 59 



57 First joint of the fore tarsi white at tip, the following joints black, 



fourth fringed with black hair above. (Mex.) . .intcrccptus Aid. 

 Fore tarsi plain, gradually infuscated 58 



58 Fore coxae black. (Mex.) pennifcr Aid. 



Fore coxae yellow. (Mex.) flazncoxa Aid. 



59 Second and third joints of fore tarsi stout, swollen, bristly. (Mex.) 



clavipes Aid. 

 Fore tarsi plain or only bristly 60 



60 Fore coxae green. (La.) 1'iridico.va Aid. 



Fore coxae pale 61 



61 Middle metatarsi witli a row of erect cilia on the front surface. 



(U. S.) scabcr Loew 



Middle metatarsi plain 62 



62 Middle tibiae with a row of bristles on the front surface. (U. S.) 



sipho Say 

 Middle tibiae with only scattered bristles. (Ga., Fla.) .furcatus V. D. 



