40 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



120 /x beyond apex of second s. m. ; marginal cell about 630 /* broad ; first s. m. 

 narrower than in Anthidium exhumatinn ; t. m. obliterated. 



The general shape and the structure of apex of abdomen seem to indicate a 

 species of the subgenus Anthidielluni, allied to the modern D. gilense Ckll. The 

 venation agrees well with D. gilense, except that the first r. n. enters the second 

 s. m. at a greater distance from the base and the marginal cell is more evenly 

 rounded at apex. 



Type. — No. 2004, Mus. Comp. Zobl. Florissant, Col. (No. 806, S. H. Scucl- 

 der Coll.). 



Heriades laminarum, sp. nov. 



Length 8 mm., robust, head and thorax black, abdomen very light reddish brown, 

 doubtless red in life ; width of abdomen 3 mm. ; length of anterior wing about 4| 

 mm., venation pale reddish-brown ; stigma fairly large, vein separating first s. m. 

 from marginal cell , not quite as long as that separating stigma from marginal 

 cell; marginal cell narrow and long, its width 300 /x, its apex rounded; first dis- 

 coidal about 225 /x shorter tlian marginal ; first s. m., on cubital nervure, about 075 

 fj. long, r. n. about but its total length is about 810; second s. m. about 645 long, 

 receiving first r. n. about 100 ju from base, and second r. n. hardly 30 from apex ; 

 b. n. bent, falling a little short of t. m. ; t. m. in a line with lower part of b. n. 

 (which shows that the bee is not a Panurgid) ; tliird discoidal shorter than in 

 a. truncorum. T. m. of hind wing not at all oblique. 



Tyjw.—No. 2005, Mus. Comp., Zool. Florissant, Col. (No. 3062, S. H. 

 Seudder Coll.). This looks like Proteriades semiruhra {Heriades semirubra 

 Ckll.), but it appears to be allied to the ordinary species of Heriades. 



Heriades halictinus, sp. nov. 



$ Length slightly over 6 mm. ; anterior wing about 4 mm. ; stout-bodied, head 

 and thorax black, abdomen dark brown ; eyes narrow. Stigma large ; marginal 

 cell about 975 /j. long and 255 wide, end rounded ; length of first s. ra. on cubital 

 nervure about 555; length of second s. m. about 510, it is not greatly narrowed 

 above, its outer margin presents a gentle double curve ; lower edge of first s. m. 

 straight; upper apical corner of second discoidal rounded; lower section of b. n. 

 curved as in Halictus, meeting t. m. ; first r. n. joining second s. m. at a distance 

 from its base equal to about half length of first t. c. ; second r . n. joining cell at 

 its extreme apex ; length of lower (curved) part of b. n. about 300 fi. 



Type. — '^o. 2006, Mus. Comp. Zool. Florissant, Col. (No. 10,564, S. H- 

 Seudder Coll.). 



At first sight one would take this for a small Halictus, but the t. ni. and 

 various other characters indicate its true -affinity. Compared with Halictus 

 similis, the principal differences in venation are as follows : 



(1) Straight section of b. n. (bounding first s. m.) almost as long as curved 



section (only about a quarter as long in H. similis'). 



(2) Oidy two submarginal cells. 



(3) Second r. n. joining second (morphologically third) s. m. at extreme 



apex (far from apex of third in H. similis). 



