190 WILLIAM J. FOX. 



simioiis ; middle segment very much as in lenfiis, but the longitudinal, medial, 

 impressed line is not foveolate ; abdomen a little shorter than head and thorax 

 united, microscopically punctured, narrower than mientns, the first segment nar- 

 rower and longer; pygidium flat, with large, sparse punctures. Black; mandi- 

 bles, except apex, scape in front, two spots on clypeus, pronotum, tubercles, scu- 

 tellum, tips of fore and medial femora, fore and medial tibiae except within, basal 

 portion of hind tibise, two basal joints of fore and medial tarsi and first joint of 

 hind pair yellowish, the apical joints of the fore and medial tarsi yellow testa- 

 ceous ; clypeus, inner orbits beneath, cheeks and sides of thorax sparsely, with 

 silvery pubescence ; abdomen with a rather distinct, silvery sericeous pile ; apex 

 of pygidium reddish, antennae beneath pale testaceous. Length 4.5-5 mm. 



% . — Anterior margin of clypeus dentate laterally, and with a medial promi- 

 nence ; first and second joints of fiagellum about equal in length ; head more 

 finely jiunctured than in the 9 '• abdomen somewhat clavate. the last segment 

 with large, coarse punctures ; otherwise very much like the 9 • 



Colorado (Morrison and Gillette) ; Utah. The yellow mandibles, 

 spots on clypeus .serve, superficially, to separate this species from 

 lentus. Mr. Johnson has given me a specimen collected in either 

 Pennsylvania or New Jersey, probably the latter State. 



74. Crabro lentus n. sp. 



9 . — Anterior margin of clypeus with a small, indistinct tooth laterally and in 

 the middle ; head more finely punctured than in .^ciitellatKs, the punctures on front 

 most distinct, while those on cheeks and upper part of head behind eyes are in- 

 distinct ; antennae tending toward subclavate, the first joint of flHgellnm about 

 one-quarter longer than the second ; pronotum tolerably well crested above, but 

 less so than in scnfellatus, lateral angles obtuse; dorsulum punctured similarly to 

 the vertex ; episternal suture of the mesopleune not angulated, but forming a 

 slight curve ; middle segment with the transverse furrow at base, the lines form- 

 ing the enclosure, and the longitudinal medial furrow, all strongly foveolated, 

 aUmg side the lateral ridges of posterior face, both inside and outside, there is a 

 strong foveolated furrow and towards the top of the sides of middle segment there 

 is another, somewhat oblique, foveolated furrow ; abdomen shorter than head and 

 thorax united, rather broadly ovate, microscopically punctured, the first segment 

 short and broad ; pygidium with large, sparse punctures. Black ; mandibles ex- 

 cept base and tegulae reddish testaceous; scape in front, pronotum, spot on scutel- 

 lum, which varies in size, fore and medial tibiffi except a line within, basal portion 

 of hind tibiae and two or three basal joints of the tarsi, yellowish ; wings hyaline, 

 iridescent, nervures brownish ; clypeus, inner orbits beneath, cheeks and sides of 

 thorax sparsely, with silvery pubescence. Length 4.5-5 mm. 



Alg()n(}uin, Illinois ( Nason) ; Utah ; Jacksonville, Florida (Ash- 

 mead). One specimen lacks the yellow on scutellum. 



75. Crabro seiitellatiis Say. 



Crabro scuteUdtus Say, Long's Second Exped., Appendix, p. 341.* 

 9 .—Anterior margin of clypeus rather broadly rounded out ; head finely, 

 though distinctly punctured, the punctuation of the front being especially promi- 



"■•• See remarks under C. impressifron^ regarding this species. 



