NORTH AMERICAN HYMENOPTERA. 



209 



103. C'rabro sigiiifer Pack. 



Tliiireopny sinmfer Packard. Proc. Eiit. Soc. Phila. vi, p. 361, l 9 . 

 Criihro dqnifer Kohl. 1. c. p. 585. 

 " % . Head more cuboidal than in T. cribreJIifer, being longer and not narrow- 

 ing so rapidly behind; the front less deeply excavated, eyes of same size, ocelli 

 arranged in a similar low triangle: in front of them a transverse line of hairs 

 extending towards the insertion of the antennse. Clypeus as in T. latipes, a lateral 

 line of silverv hairs along the front edge of the eyes as usual. Antennaj simple, 

 joints cylindrical, long and slender, sutures well marked, second joint a third 

 longer t'han the first or third; joints showing a slight tendency to become flat- 

 tened beneath ; black scape yellow, black at base on upper side : mandiljles black, 

 a little yellowish at base. Prothorax above reddish yellow, interrupted in mid- 

 dle: thorax much as in T. cHbrellifer ; a reddish yellow stripe on scutellum ; hind 

 edge of yellow tubercle very convex. Fore coXcB, femora and trochanters y)lack, 

 tibife expanded into a broad concavo-convex, shield-like plate, as long as broad, 

 subpeutagonal, the angles much rounded, and the end obtuse, being angulated 

 near the middle of the posterior edge, and near the base of the anterior edge; 

 tibia} yellow, but the plate dark, with light lines radiating from the middle of 

 tibijfi, with other independent lines. Tarsi large, well deyeloped, fuscous ; middle 

 and hind femora black ; tibite. yellow, with an external dark mark, tarsi fuscous. 

 Abdomen smooth and shining as usual, yellow fasciae as in T. cribreMifer, but they 

 are broader and heavier, not indented, the stripes being continuous across the 

 abdomen on the fourth and fifth rings; edge of sixth ring obscurely yellow, tip 

 spatulate, a little hirsute. Length of body, .42; head and thorax. .20; abdomen, 

 .22 inch. 



" Brunswick, Maine. August, on flowers of Spiraa alba. 



" Easily known by its short, dark, shield-shaped plate or vexhil- 

 luin, which is as broad as long, and the presence of a yellow band 

 on the meso-scutellum ; its simple, non-expanded antenna, the fus- 

 cous yellow spot on the thorax, and entire non-indented abdominal 

 fasciae. It is of the same size as T. cribrel/ifer, but a little shorter. 



" 9 . A female specimen received from iSlr. Sanborn differs from 

 the other sex by its shorter head, more deeply excavated front, and 

 more convex vertex ; the clypeus is longer, scape of antenna} more 

 thickened, otherwise the color is the same. The thorax is sculptured 

 and spotted the same, but the enclosure of the propodeum is more 

 deeply furrowed and rugose on each side of the mesial furrow. Fore 

 and middle legs colored as in S. pegasa^, internal ring and two re- 

 mote fasciae one-half narrower than in T. pegasiis, where they form 

 a broad, scarcely interrupted band ; terminal band narrower, tip of 

 abdomen a little broader. This 9 will probably be eventually found 

 to be the 9 dgnifer, differing likewise from T. pegasns 9 in it« 

 brighter yellow spots and different arrangement of the abdominal 



fascise. 



"Mass. (Sanborn)." 



Belongs, no doubt, to group tein(lglo-'<-<its. 



TRANS. AM. ENT. SOC. XXII. (27) JUNE, 1895. 



