\'>v.. '09] KXToMoi.ocH \i. XKWS 379 



says this species occurs with the preceding- (frigidn-ni). In 

 all the collecting at Florissant no bidcnttititnt has been found 

 while fri^iduin is very common. 



Trypoxylon nigrellum n. s>p. 



Female Length 7 mm. ; slender. Anterior margin of the clypeus 

 produced into a narrow bidentate tooth, the lobes of which are short 

 and obtuse. Space between the eyes at the vertex not twice as great 

 as the space between them at the clypeus. Front rather coarsely 

 granular; the vertex with small close punctures. Third antennal 

 joint a little shorter than the fourth; the antennae slightly thickened 

 toward the apex; the apical joint somewhat longer than the preced- 

 ing. Dorsulum and the scutellum shining, with distinct, scattered 

 punctures; the scutellum not impressed; the punctures on the pleune 

 more separated than on the dorstilum, the suture deep and strong. 

 Metanotum with transverse striae (some of the strise are oblique), 

 there is a strong medial furrow ; metaplettrae rather strongly obliquely 

 striated ; the posterior face granular or slightly striato-granular, with a 

 deep median furrow. The furrows of the metanotum and the pos- 

 terior face are not connected. The posterior tibiae with a few feeble 

 spines. The first abdominal segment but little longer than the sec- 

 ond, and not strongly nodose at the apex; the second segment a little 

 more than twice as long as the width at the apex. Black; palpi pale 

 brown; tips of the mandibles and the teguke testaceous; spurs pallid. 

 Wings hyaline, the apex not distinctly dusky, iridescent; the vena- 

 tion black. 



Type locality: Lee County, Texas. Two females collected 

 by G. Birkmann May 3, 1906, and April, 1907. The specimen 

 collected April, 1907, was chosen as the type. 



Besides the characters mentioned in the foregoing- table this 

 species differs from bidcntatnin Fox, its nearest ally, in tin- 

 distinctly striated metapleurae (the metaplenrae of bidciitutiiin 

 are shining and not distinctly sculptured). 



Trypoxylon apicale Fox (Tr. Am. Ent. Soc., xviii, p. 143, 1891). 

 "Occurs in Canada and at Beverly, Mass." 



Trypoxylon regulars Vier. (Tr. Am. Ent. Soc., xxxii, p. 205, July, 1906). 

 Douglas County, Kansas, altitude 900 feet. 



GROUP EXCAVATf.M. 



Large, shining black species, as a rule not densely pilosed ; 

 the hind tarsi white; the wings fuscus or hyaline; no enclosed 

 area on the metanotum, which is punctured or transversely 



