NORTH AMERICAN IIYMENOPTERA. 177 



antennse of the males. Pronotum dentate laterally ; first joint of 

 hind tarsi sometimes longer than the length of the longer spur of 

 tibiae, though usually of the same length ; pygidium broad, not de- 

 pressed, and with appressed pubescence ; male antennse not dilated, 

 fringed more or less beneath with long, thin pubescence, which is 

 more evident in some species than in others ; % anterior legs not 

 deformed, their femora slightly flattened, and in some species clothed 

 with more or less long, dense, white pubescence beneath, as is also 

 the mesosternum. 



This group may be identical with AnotJnjreus Dahlli., but it differs 

 from it in some of its characters : by the fringed antennae and den- 

 tate pronotum. 



56. Cral»r« (*iii;;iiliifii<$ Pack. 



Thi/reopns chujulatii.'i Packard, Proc. Ent. Soc. Pliila., vi, p. 36(3, % 9 . 

 Crabro cingulatus Kohl, Zool. Jahrb. (Abth. f. Syst. Geogr., etc.), iii, p. 584. 



9- — Anterior margin of clypeus broadly truncate, somewhat incurved, the 

 lateral angles very prominent, almost tooth-like ; head finely and closely punc- 

 tured, the front not at all striate; space between the hind ocelli slightly less than 

 that between them and the nearest eye-margin (in the other species of the group 

 it is greater) ; first joint of the fiagellum a little shorter than the second ; pro- 

 notum well developed above, not strongly dentate laterally ; dorsulum closely 

 punctured, more strongly so than the head ; episternum mesopleuralis punctato- 

 striate ; episternum and epimerum mesothoracis finely punctured, much more 

 finely so than the mesopleurse, in fact they appear impunctate ; middle segment 

 above and on posterior face covered with very strong, irregular ridges or folds 

 forming large fovete, the longitudinal central channel deep, interrupted at base 

 of posterior face by a large, hexagonal fovea, on the upper surface a strongly 

 marked ridge forms a large semi-circular enclosure, at the base of which there 

 is a transverse, foveolated furrow, sides of middle segment not striated, somewhat 

 rugose at extreme apex ; first joint of hind tarsi distinctly longer than the longer 

 spur of hind tibise ; abdomen closely and microscopically punctured, most dis- 

 tinctly beneath, pygidium coarsely and longitudinally rugose. Black; mandibles 

 except apical third, two large spots on clyi)eus, which in the only specimen before 

 me are united by a slender line, scape entirely, pronotum above, tubercles, scu- 

 tellum, spot on metanotum, apical half of fore and medial femora and a line on 

 under side, the tips of hind pair, tibiie except a spot within on middle and hind 

 pair, first joint of tarsi, a broad band on first dorsal segment before apex, pointed 

 anteriorly in the middle, a large spot on segments 2 and 3, that on second segment 

 broadest and that on third longest, a band on segments 4 and 5, that on the fifth 

 segment twice emarginate anteriorly, and a small spot at each side of ventrals 2 

 and 3, yellow ; apical joints of tarsi and tegulse testaceous ; clypeus, frontal de- 

 pression and cheeks with silvery pubescence, that on the thorax beneath sparser 

 and more grayish ; wings subhyaline, with a yellowish tinge, nervures and stigma 

 yellow testaceous. Length 9 mm. 



%: — Long and slender; scape compressed; fiagellum distinctly fringed, first 

 joint a little longer than the second ; space between hind ocelli greater than that 



TKANS. AM. ENT. SOC. XXII. (23) JUNE, 1895. 



