27G E. T. CRESSON. 



Thorax black, immaculate; abdomen with widely interrupted white 



bands ni«estus n. sp. 



Abdomen black, more or less ferruginous at base. 



Scutelluin with transverse yellow line at base; posterior margin of pro- 

 thorax and of first abdominal segment distinctly yellow; body strongly 



silvery-sericeous; wings clear bellus n. sp. 



Scutellum immaculate; body scarcely sericeous; wings smoky. 



l»a»»ilari$4 n. sp. 

 Mesothorax finely punctured or granulated. 



Abdomen above with narrow interrupted white bands. 

 Clypeus and scape beneath of % yellow. 



Tarsi black, anterior tibise with white spot at base above tristis n. sp. 



Tarsi testaceous, anterior tibiee entirely white above fiilelis n. sp. 



Clypeus and scape beneath of % entirely black latei'a.li$i Pack. 



Abdomen jnore or less ferruginous at base. 



Legs mostly black; abdomen with interrupted yellow bands or spots. 



Abdomen sparsely punctured ru!>tticiis n. sp. 



Abdomen very densely punctured rufivciltris n. sp. 



Legs black, tibife and tarsi yellow ; abdomen with entire yellow bands. 



piiiiiiltis n. sp. 



IVysson plagiatiis n. sp. ^ aurinotas Packard {nee Say i, Proc. Ent. Soc. 

 Phila. vi, p. 44(1. — J . — Black, opaque, covered more or less with a pale sericeous 

 pile; face, clypeus and sides of metathorax above clothed with a short dense 

 golden-yellow pubescence ; head deeply not closely punctured, the space within 

 ocelli not raised ; mandibles except tips, palpi, two or three basal joints of an- 

 tennae, tegulse and most of legs, fulvo-ferruginous ; mesothorax, scutellum and 

 niesopleura with large, deep, coarse punctures, confluent on mesopleura; post- 

 scutellura elevated into a transverse ridge; tubercles, uneven line on posterior 

 margin of prothorax confluent on each side with the tubercles, large transverse 

 spot on scutellum, the prominent obtuse spines of metathorax, spot or line on all 

 the coxse, a large dilated subtriangular spot on sides of first abdominal segment 

 above, sometimes notched on inner ^de and almost confluent on posterior middle 

 of the segment, a line on each side at tip of second and third segments and 

 generally a small more or less obscure spot on each side at tip of fourth segment, 

 lemon or fulvous-yellow, soinetimes fulvo-ferruginous; metathorax above coarsely 

 reticulated, the basal middle with longitudinal rngfe; wings fuscous or fuliginous, 

 more or less violaceous, the third submarginal cell, in all the specimens examined, 

 narrowed to a point on the marginal, sometimes shortly petiolated, in the posterior 

 wings the anal and discoidal cells are separated by a short transverse nervure; 

 coxse at base and femora above black or fuscous, sometimes all the femora except 

 extreme base and tip are fuscous and the posterior tibise yellowish above at tip ; 

 abdomen rather deeply but not closely punctured except on apical segments ; 

 segments 2 — 5 above and beneath have a very narrow pale sericeous border, the 

 second segment beneath is more or less ferruginous. Length .50 — .55 inch. 



'^.—Closely resembles the 9, but more densely sericeous; apical joint of an- 

 tennse narrower and longer than the preceding joint, obtuse at tip and excavated 

 beneath; apical segment of abdomen above subquadrate, depressed iind densely 

 fringed at tip with curved yellow hair, the sides terminating in a stout obtuse 

 tooth. Length .45 — .50 inch. 



Bab. — Illinois, Nebraska, Texas, Washington Territory. Six % 9 



