Dec, I9I2.] Alexander: Revision of Brachypkemna. 233 



coxas pale, yellowish-white ; femora brown, darkening outwardly, the tip ab- 

 ruptly pale yellowish-white ; tibiae with a basal ring, subequal in width and of 

 the same color as the femoral band ; remainder of the tibia; dark brown ; tarsi 

 brown, the apical segments becoming paler, yellowish-brown. 



Wings : costal cell yellowish-brown ; cell R2 almost clear, more yellowish 

 on the costal margin ; outer end of cell R^ narrowly blackish-brown on the 

 caudal margin ; cell R-^ dark brown with a rounded hyaline drop ; cell Mj almost 

 hyaline, with a large oval, even clearer, drop at its end ; veins very indistinctly 

 margined with darker; stigma dark brown, paler in the center. Venation (see 

 Fig. a) : Rg rather short, beyond the arcuation, a little longer than M1+2 between 

 r-iii and in ; r-iii a little more distinct than is usual in the genus ; basal deflection 

 of Cu^ just beyond the fork of M. 



Abdomen : tergum dark brown, the extreme base of the segments paler, 

 less distinct on the apical segments ; sternum light brown with an elongate 

 blackish spot in the middle of each segment ; hypopygium rather browner than 

 in related species. 



(^, length, 15.2 mm.; wing, 18.4-20 mm. Fore leg, femur, 12. i nun.; tibia, 

 14.3 mm. Hind leg, femur, 14.8 mm.; tibia, 15.9 mm. 



$, length about 15 mm.; wing, 16.6 mm. Fore leg. femur, 11 mm.; tibia, 

 13 mm. Hind leg, femur, 12.7 mm.; tibia, 14.6 mm. 



Distribution. — Mexico, Teapa in Tabasco (H. H. Smith) ; Gtiate- 

 mala, Livingston (Schwarz-Barber) ; Nicaragua, Escondido R., 50 

 miles from Bluefields (Richmond) ; Panama. Gatun (Jennings), Porto 

 Bello (Busck), Paraiso (Busck). 



Distinguished from the other species with pale femoral tips, 

 Candida and pictipcs, by the dark tibial apices. 



Brachypremna Candida, new name. 



1830. Tipiila albimana Wied., Aussereur Zweifl. Insekt., Vol. 2, p. 615. non T. 



atbimana Fab. 1900. Tipxda albimana Hunter, Trans. Am. Ent. Soc, Vol. 



26, p. 286. 1902. Tipula albimana Kertesz, Cat. Dipt., Vol. 2, p. 281. 



Head : rostrum yellowish ; nasus pale with pale hairs ; palpi, first segment 

 dark brown; second segment mainly yellowish; remainder black. Antennae, 

 first two segments yellowish, remainder dark brown. Front, vertex and occiput 

 pale with a gray bloom. 



Thorax: praescutal stripes about as in breriventris, but very indistinct; the 

 usually distinct markings of the mesothoracic scutellum and postnotum not at 

 all evident. Pleurae brown, without distinct markings. Halteres brown, ex- 

 treme base of the stem pale. Legs : femora brownish-yellow at base, gradually 

 darkening to brown, with a rather broad, apical yellow ring; tibia with a basal 

 yellow band about as wide as the femoral ; apice of the tibia more or less 

 yellowish-white, broadest on the hind leg, where it covers nearly one half of the 

 segment ; tarsi pale yellowish-white. 



Wings : almost hyaline, cell C only a little more yellowish than the rest of 



