184 WILLIAM J. FOX. 



14. Group pinguis. 



Ocelli forming a curved line ; mandibles simple, pointed at apex, 

 not dentate ; both sexes with a pygidium, which is broad, flat, not 

 depressed or excavated ; fore tarsi not flattened in S . 



Beginning with this group all the species following have the ab- 

 domen immaculate. Group phigui>i is the only one of Cnibro having 

 the mandibles not dentate at apex and in which the males are fur- 

 nished with a pygidial enclosure ; in these characters the group ap- 

 proaches the genera Eitfowognaihtis and A)iacr((bro, but is otherwise 

 distinguished. It represents Lindenlux 8t. F. and Br. 



63. Crabro errans n. sp. 



9 . — Anterior margin of clypeus roinidfd out, indistinctly dentate laterally ; 

 head a little more finely punctured than \n latifrons ; fore ocellus situated in a 

 strong depression, the furrow running from it to the frontal depression well 

 marked, hut not so hroad as in the species mentioned ahove ; the space between 

 the fore and posterior ocelli is less than that between the posteriors and the 

 nearest eye-raargin, but not so much as in latifrons: furrow leading from each 

 posterior ocellus to the inner orbit very distinct; space between eyes beneath, at 

 their nearest point of convergence, about equal to a little more than half the 

 length of the sc^ipe ; first joint of flagelluui a little longer than the second ; dor- 

 sulum more distinctly punctured than the front; enclosure of middle segment 

 well marked, at the base with a transverse, foveolated furrow, from which extend 

 some longitudinal, coarse striae, so that there appears to be a semi-circular, de- 

 pressed, coarsely .striated area at the base of the enclosure, beyond these striations 

 the enclosure is smooth, shining; furrow forming the enclosure heavily foveo- 

 lated ; posterior face of middle segment rugose apically, the lateral ridges distinct, 

 these margined by a furrow on each side, the outer being distinctly foveolate ; 

 length and sha})e of abdomen apparently variable ; in some specimens about as 

 long as head and thorax united and elongate-ovate, again distinctly shorter than 

 those parts and broadly ovate ; pygidium rather acute at apex, flat, not depressed. 

 Black ; mandibles, except apex, scape in front, pronotum above, tubercles, spot 

 on scutellura, sometimes a1)sent, tips of fore femora, anterior and medial tibite, 

 except a line within, the basal portion of hind tibise, and basal joint of all the 

 tarsi yellow, remaining joints of tarsi brownish, those of the hind i)air blackish ; 

 flagellum beneath testaceous; clypeus, inner orbits beneath, cheeks and thorax 

 on sides and beneath, with silvery pubescence ; legs and abdomen with a silvery 

 sericeous pile. Length 3.5 -4.5 mm. 



'J, . — First joint of flagellum distinctly longer than the second ; cheeks un- 

 armed ; otherwise as in the female. Length 3-3.5 mm. 



Colorado (Gillette) ; Las Cruces, New Mexico (Cockerell) ; Illinois 

 (Robertson); District of Columbia ; Pennsylvania (Johnson). The 

 Illinois specimens are the smallest and seem to differ slightly in the 

 sculpture and may be another species. C errans may be the C. 

 (Lindenim) columbianus Kohl, but I cannot determine satisfactorily, 

 from the description, whether it is that species or not. 



