5G2 J\Ir. T. D. A. Cockerell — Descriptions and 



massive mandibles, and considerably shorter marginal and 

 second submarginal cells. O. pseudnanrulenta nests in snail- 

 shells ; does the Guatemalan species do the same? 



Perdita tropicalis, sji. n. 



^ . — Length about 4^ mm. 



Head and thorax moderately shining, rather dark green, 

 the metathorax varying to quite blue ; hair of head and 

 thorax white, long and rather abundant, the me>othorax 

 quite hairy; head very broad, facial quadrangle broader 

 than long, cheeks unarmed ; clypeus broad and low, pro- 

 duced at sides, pale yellow except the broad upper margin, 

 the upper limit ol: the yellow irregular; labrum pale yellow, 

 as also the long mandibles except their broad rufous apices; 

 lateral face-marks L-shaped, in the lower corners of the face ; 

 no supraclypeal or dog-ear marks ; antennje dark above, 

 pale yellowish below ; thorax w ithout light markings ; 

 scutellura with a curious purplish-black tint ; tegulae 

 hyaline, with a pale yellow spot. AYings hyaline, iridescent, 

 the nervures aud margin of stigma fuscous ; marginal cell 

 rather long. Legs pale yellowish testaceous, with long 

 hairs ; anterior and middle femora behind and hind ones on 

 both sides with a large dark brown cloud; hind tibia? with a 

 brown suffusion. Abdomen shining, warm yellowish ochreous, 

 the segments with dark fuscous subapical bands, which turn 

 "upwards at sides; first segment nearly all dark; venter 

 reddish, without markings. 



Hub. Gualan, Guatemala, Feb. 15, 1912 (H^. P. Cockerell). 

 Three collected from yellow flowers of a tree. 



In my key to Perdita (Proc. Phil. Acad. 1896) this runs 

 to 71, but is not close to either of the species there indicatetl, 

 nor to the later-described species (P. rliudura, P. mentzeli- 

 arum), which also fall in this vicinity. In the face-markings, 

 but not otherwise, there is a certain resemblance to P. calli- 

 cerata. The species is as isolated as its geographical position 

 would lead us to expect, although it presents rio very striking 

 features. The maxdlary palpi are six-jointed, the first joint 

 large; t'.ie labial palpi have the first joint about five times as 

 long as the second. 



Plilor/lossa may arum, sp. n. 



? . — Agreeing with P. mexicana (Cress.), except as fol- 

 lows : — Abdomen shining olive-green, first segment with 

 abundant long pale fulvous hair, except at sides, where it is 

 dense and creamy white, but on the upper part of sides, at 



