42 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



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

 almost beneath the upper insertion of the 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 breadth ; b. n. straight, except near the 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 discoidal 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 /* : 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 

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

 s. m., 375; length of b. n. about 1875. 



Type. — 2008, Mus. 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 typify 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 adequately the palpi and other minute characters so 

 useful in segregating modern genera. 



ANDRENIDAB. 



Libellulapis, gen. nov. 



9 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. 



9 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 jx (all 

 the following measurements are in /a) ; 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 



