Vol. XXVl] ENTOMOLOGICAL NEWS IQ 



17 Knob of the halteres infuscated 18 



Knob of the halteres yellow 23 



18 Middle and hind tibise entirely black 19 



At least the middle tibiae largely yellow 20 



19 Middle metatarsi ciliated above. (Cuba.) pilosus Loew 



Middle metatarsi not ciliated. (Mex.) inornatus Aid. 



20 Last four joints of hind tarsi regularly decreasing in length. 



(W. I., Brazil.) jucundus Loew 



These joints not regularly decreasing, the last two or three being 

 subequal 21 



21 Last two joints of hind tarsi subequal and a little swollen. (Mex.) 



atricauda Aid. 

 Last three joints subequal and a little flattened 22 



22 Last three joints of hind tarsi glabrous, middle metatarsi as long 



as their tibiae. (Mex., Brazil.) triseriatus Aid. 



Last three joints of hind tarsi hairy, middle metatarsi longer than 

 their tibiae. (Ga.) leonardi V. D. 



23 Apical third of fore coxae with trochanters and base of femora 



yellow. (Mex.) coxalis Aid. 



Not more than the extreme apex of fore coxae yellow 24 



24 Third antennal joint large 25 



Third antennal joint small or of moderate size 26 



25 Second antennal joint with long bristles. (Mex.) .astcquinus Bigot 

 Second antennal joint with short bristles. (Mex) .purpuratus Aid. 



26 Second antennal joint with short bristles 27 



Second antennal joint with long bristles 30 



27 Middle tibiae with a row of bristles on the lower front surface ex- 



tending the whole length 28 



Middle tibiae with not over four bristles at most in the same longi- 

 tudinal line 29 



28 Fore metatarsi with a row of erect bristles below, second joint 



without bristles. (Guatemala.) nigriinanus V. D. 



Fore metatarsi with a few bristles near tip, second joint with a 

 row of small bristles below. (Mex.) gcnualis Aid. 



29 Bristles on the second joint of the antennae shorter than the diame- 



ter of that segment. (Mex.) brcriscta Coq. 



Bristles on second joint about as long as the antennae. (Cuba.) 



diyitattts V. D. 



30 Middle tibiae with a row of stout bristles on the outer side, middle 



metatarsi ciliated. (Mex., Brazil.) triscriains Aid. 



Middle tibiae with not over four bristles in a row, middle meta- 

 tarsi not ciliated 31 



31 Last two joints of hind tarsi flattened 3_> 



Last joints of hind tarsi not flattened ' 33 



