cockerell: FOSSIL HYMENOPTERA FROM FLORISSANT. 45 



way the head is crushed ; head and thorax black ; abdomen nearly colorless, with 

 broad suffused reddish-brown bands on apical margins of the first three segments, 

 the apex also dark; abdomen hairy all over; legs light reddish-brown, hind tibia 

 about If mm. long, tarsi hairy ; wings very hairy. The following wing-measure- 

 ments are all in p : stigma large, pointed apically, width about 300, part within 

 marginal cell about 450 long ; marginal cell long and pointed, the apex on costa, 

 length of cell 1605, breadth 375 ; three submarginals, first and third long, second 

 short, much narrowed above, almost triangular, third much narrowed above ; first 

 s. m. on cubital nervure 810, its total length 1125 ; second s. m. on cubital n., 

 405, on marginal, 135 ; third s. m. on cubital n., 720, on marginal, 330 ; bend of 

 third t. c. about 210 from cubital n. ; first r. n. enters second s. m. at extreme apex, 

 second enters third s. m. about 90 from apex ; second r. n. leaves cubital n. at a 

 right angle, but gently curves inwards, being nowhere at all bent ; upper section of 

 b. n. 330 ; lower section 630; lower section gently curved, but not at all as in the 

 Halictines ; b. n. falling about 60 short of t. m., which is oblique, its lower end 

 more apicad. 



Type. — No. 2013, Mus. Comp. Zool. Florissant, Col. (No. 14,288, S. H. 

 Scudder Coll.). The venation is not exactly like that of any modern species 

 with which I have compared it, but the differences are unimportant. 



Andrena ( ! ) clavula, sp. nov. 



$. Length 8. mm.; width of thorax 3, of head 2; length of anterior wing 6f 

 mm. ; eyes ordinary ; flagellum stout, subclavate, rather short, about 300 /x broad 

 near end ; head and thorax black, femora dark ; hind tibiae and tarsi apparently 

 pale, but middle tibiae dark ; wings somewhat dusky ; abdomen subclavate, dark 

 reddish-brown, with three rather narrow pale bands, occupying hind margins of 

 segments 2 to 4 and the extreme bases of the adjacent segments. 



Venation (front wings) as in A. sepulta, except that second s. m. is narrower and 

 more parallel-sided. Measurements in fx : width of stigma 240; length of marginal 

 cell about 1455, its width 360 ; lower section of b. n., 630 ; second s. m. on cubital 

 n., 360, on marginal, 155. 



Type. —No. 2014, Mus. Comp. Zool. Florissant, Col. (No. 6963, S. H. 

 Scudder Coll.). The shape of the abdomen is like that of a 9 Ceratina, or 

 possibly certain Halictines, but the venation does not agree with these. As 

 the venation is exactly the same (speaking generically) as that of A. sepulta, 

 it seems that the insect should be considered congeneric. 



SPHECOIDEA. 



CRABRONIDAB. 



Tracheliodes mortuellus, sp. nov. 



Black; length 7 mm. or somewhat more; abdomen petiolate; wings short; 

 metathorax coarsely striate or ridged ; upper posterior part of pleura finely striat- 

 ulate ; ocelli large, in a fairly high but not nearly equilateral triangle ; mandibles 

 stout, bent inwards apically (i. e. the outer edge becoming very convex), with the 



