42 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



from the obliquity of the first t. c. ; it receives first r. n. before the middle, at a point 

 almost beneath the upper insertion of tlie first t. c. ; first s. m. longer and larger 

 than second, but not very greatly so, its lower margin gently curved, giving it a 

 considerable breadtii ; b. n. straight, except near tlie basad end, where it bends 

 downwards, and is attached a short distance basad of the t. m. ; t. m. not oblique; 

 second r. n. gently curved outwards, its junction with the third s. m. forming an angle 

 greater than a right angle ; second discoidal cell longer below than above, but not 

 very greatly ; first discoidcd not so long as marginal, but not greatly shorter. The 

 structural characters of the body cannot be ascertained. 



Calyptapis florissantensis, sp. nov. 



Black ; anterior wing 8 mm. long, venation distinct, brown. The following 

 measurements are in yu : width of marginal cell, 630 ; length of t. m., 300; width 

 of second discoidal cell at apex, 825 ; from insertion of second r. n. to appendix at 

 endof tliird s. m., 135; distance between insertion of first r. n. and base of second 

 8. m., 375; leiigtli of b. n. about 1875. 



Typc. — 200S, Mas. Com. Zool. Florissant, Col. (No. 4933, S. H. Scudder 

 Coll.). 



So far as the venation goes, this genus is not far from certain species of the 

 modern Melissodes. If it were a living insect, differing from Melissodes only 

 in the manner indicated, it might be held to tj])ify only a subgeneric group ; 

 but under the circumstances, and with a probability that the mouth-parts, etc., 

 if preserved, would afford additional characters, it seems best to treat it as a 

 distinct genus. It is probably too much to hope that fossil Anthophoridae will 

 ever be found, showing adw|uately the palpi and other miuute characters so 

 useful in segregating modern genera. 



ANDRBNIDAE. 



Libellulapis, gen. nov. 



? Eyes apparently very prominent, the anterior part of face produced ; first 

 s. m. not so long ; second discoidal narrower at end ; second r. n. curved or bent out- 

 wards (straight in Parandrena) ; size small, abdomen conspicuously banded. The 

 head, as preserved, has a singular resemblance to that of a dragonfly. 



Libellulapis antiquorum, sp. nov. 



? Length about 6 mm. ; anterior wing about 5 mm. ; width of thorax about 2^, of 

 abdomen about 2 mm. Head and thorax black ; eyes prominent; flagellum stout ; 

 abdomen colorless, with a large brown patch on each side of middle of third seg- 

 ment ; segments 4 and 5 each with a very broad entire brown band; 6 with a 

 fainter band ; middle and hind femora stout ; venation brown ; stigma large, but 

 rather slender, with a large part in marginal cell, width of stigma about 195 [x (all 

 the following measurements are in yu) ; marginal cell long and narrow, the tip on 

 costa, width of cell about 300; b. n. practically straight, except a slight bend at 

 proximal end, meeting t. m., which is obFique, at least 45° out of the straight line 



