NORTH ABIERICAN HYMENOPTERA. 165 



of flagellura, etc., will serve in distinguishing it. The discovery of 

 the % may relegate it to the preceding group. 



40. Crabro discretus n. sp. 



9 . — Head finely and closely punctured, more transverse than in xqnalu, front 

 with the punctures stronger and closer; space between eyes at base of clypeus 

 but sliorhtly, if anything, less than the width of the latter in the middle; anterior 

 margin of clypeus broadly truncate, not or scarcely dentate laterally : first joint 

 of flagellum about as long as the two following united ; pronotum anteriorly 

 ridged at the sides only, rather strongly dentate at sides ; dorsulum subopaque, 

 with tolerably strong punctures, close autei-iorly and evenly separated on posterior 

 portion, those on mesopleurae larger and sparse, episternal suture strongly foveo- 

 late : middle segment about as in ieqnaUs, but a little less strongly rugose, and the 

 foveas formed by the rugfe smaller, fovete margining the posterior face outwardly 

 much smaller, and the sides more distinctly striated ; pygidium coarsely punc- 

 tured, longer and less triangular than in the species mentioned above. Black ; no 

 yellow ou tegulse or metanotum ; small spot on mandibles basally, clypeus except 

 fore margin, scape entirely, pronotum, tubercles, scutellum more or less, extreme 

 tips of four anterior femora, tibise except a spot within, tarsi (apical joints darker), 

 narrow sinuated spot on each side of first abdominal segment, broader spots, 

 pointed within, on .second longer, narrow spots on third, and a band on fourth 

 and fifth, yellowish ; ventrals not yellow, but their apical margins testaceous ; 

 wings fusco-hyaline, nervures and stigma dark testaceous. Length 9 mm. 



District of Columbia (in coll. Ashmead). 



41. Crabro argus Packard. 



Crahro argus Harris (no descr.), Catal. Ins. Mass., p. 68 (teste Packard). 



Thyrecpns argus Packard, 1. c, p. 359, % . 



Crabro argus Kohl, 1. c, p. 584. 

 9 . — Clyiieus broadly truncate anteriorly, strongly dentate at each side, shaped 

 as in C. cingulatus ; head finely and closely pixnctured, most strongly so anteriorly ; 

 space between hind ocelli rather distinctly less than that between them and 

 nearest eye-margin ; first joint of flagellum shorter than the second ; pronotum 

 anteriorly ridged at extreme sides only, the lateral tooth strong; dorsuluin punc- 

 tured like the vertex, but more strongly; epimerum mesopleuvalis with tolerably 

 fine, well separated though not sparse punctures, the episternal suture very 

 strongly foveolate ; middle segment above with coarse ridges, which form very 

 large foveas, on posterior face the mesial furrow is restricted to a medial, pyriform 

 pit, which is surrounded by a series of large fovese. exterior to these fovese on 

 each side is a deep furrow, margined within and without by a ridge, sides of 

 middle segment not striated ; pygidial area longitudinally rugose. Black ; man- 

 dibles except apex, scape, clyiieus more or less, two strongly sinuated sjiots on 

 pronotum, tubercles, tips of fore and medial femora, tibise except a spot within, 

 first joint of tarsi except ajiex, two rather broad, slightly sinuated spots ou first 

 abdominal segment, almost touching within, large spot at each side of second 

 pointed within, longer and somewhat narrower spots on third, long spots on 

 fourth almost touching within and a band emarginate on each side on fifth, yellow ; 

 scutellum black ; wings subhyaliue, with a slight yellowish cast, darker apically, 

 nervures and stigma testaceous. Length 9 mm. 



TR.\.NS. AM. ENT. SOC. XXII. JUNE. 1895. 



