70 E. T. CRESSON. 



^ . — Face, clypeus, labrum, mandibles, lower posterior orbits, antennae be- 

 neath, two spots on prothorax, tubercles, tegulse and most of four anterior legs, 

 yellow; abdomen with yellowish band on segments 1 — 3, slightly interrupted 

 on disk and dilated laterally on second segment; fourth segment with two 

 small pale spots. Length .20 inch. 



Hah. — Colorado, (Ridings). Five specimens. Closely resembles 

 8-maculata Say, but much smaller and with clearer wings. 



Perdita obscurata. — 9- — Form of zeh-ata; head and thorax blue, 

 thinly clothed with pale pubescence; sides of face, sides of clypeus, spot on 

 disk, mandibles except tips, scape beneath, spot on each side of prothorax, 

 tubercles and tegulse, yellowish; flagellum testaceous beneath; thorax smooth 

 and shining; wings as in zebraia except that the second submarginal cell is 

 smaller, being scarcely more than one-third the length of the first submar- 

 ginal; legs brown, with pale pubescence, knees, four anterior tibife in front 

 and all the tarsi yellowish; abdomen piceous, shining, pubescent at tip, an 

 obscure yellowish fascia, interrupted medially at base of segments 2 — 4. 

 Length .23 inch. 



%. — Brighter in color and more pubescent; all beneath antennae, narrow 

 line on lower posterior orbits, scape entirely, flagellum except brown line above, 

 interrupted line on prothorax, tubercles, tegulse and the legs entirely except 

 spot on apex of posterior femora above and their tibise above, bright yellow; 

 a narrow uneven, ill-defined yellowish band at base of segments 2 — 6, apical 

 segment and venter fulvo-testaceous. Length .20 inch. 

 Hub. — Georgia, (Morrison). Two specimens. 



Perdita interrupta. — %. — Head and thorax blue, thinly clothed 

 with pale pubescence; head broader than thorax, face broad and rather 

 thickly pubescent, lower corner of face, clypeus, labrum, and mandibles 

 except tips white; flagellum pale beneath; thorax subopaque, tegulee dull 

 testaceous; wings hyaline, neuration as in hyalina ; legs black, thinlj' clothed 

 with pale pubescence, knees and line on the four anterior tibise, and their 

 tarsi yellowish; abdomen oblong-ovate, convex, shining black, a pale yel- 

 lowish fascia on segments 2 — 5, interrupted on the disk and more or less 

 suddenly dilated laterally, sometimes a pale lateral. spot on sixth segment. 

 Length .23 inch. 



Hah. — California, (Crotch). Three specimens. 



Wlacrotera texana. — 9- — Piceous, smooth and shining, rather thinly 

 clothed with a short whitish pubescence, sparsely punctured; head a little 

 wider than thorax, anterior orbits with a deep longitudinal groove, clypeus 

 with a few coarse punctures, tips of mandibles reddish; antennae short, flagel- 

 lum brown; metathorax very short, transverse rounded on the sides; tegulsD 

 pale testaceous; wings hyaline, nervures brown; marginal cell about as long 

 as first submarginal, obliquely truncate at tip, appendiculate, second sub- 

 marginal about half the length of the first, narrowed one-half towards mar- 

 ginal; legs clothed with pale pubescence, that on posterior tibise long and 

 loose; abdomen ovate, depressed, apical margin of segments obscurely testa- 

 ceous, anal fimbria short and pale; venter broadly fasciate with testaceous. 

 Length .35 inch. 



Hah. — Texas, (Heiligbrodt). Three specimens. 



