502 PROCEEDINGS OF THE ACADEMY OF [1893. 



7.--Tachytes praedator Fox. 



T. praedator Fox, 1. c. p. 240, <? $ . 



Virginia and Texas. 



8.— Tachytes columbiae Fox. 



T. Columbia; Fox, 1. c. p. 241, 9 $ . 



District of Columbia, Virginia, New Jersey. 



9. -Tachytes crassus Patt. 



T. crassus Patt. 1. c. p. 393, 9 ; Fox, 1. c. p. 241, 9 $ . 



Connecticut, New Jersey (August), So. Dakota, (Aldrich). 



10. --Tachytes pepticus Say. 



Lyrops pepticus Say, Bost. Journ. I, p. 371. 9 $ ■ 

 Tachytes pepticus Sin., Cat. Brit. Mus. Hyin. IV, p, 308. 



From Illinois westward. 



11.— Tachytes fulviventris Cress. 



T. fulviventris Cress., Proc. Ent. Soc. Phila. IV, p. 466. 9 • 

 T. cezlebs Patt., Bull. U S., Geol. Survey, V, p. 355. $ . 



From Nebraska westward. 



12. —Tachytes spatulatus Fox. 



T. spatulatus Fox, 1. c. p. 243, $ , 



Nevada. 



SECTION II. 



FEMALES. 



1 — Greater part of femora reddish 2 



Greater part of femora or the legs entirely, black 3 



2 — Abdomen black, the three first dorsal abdominal segments only 



with silvery pile at apex distinctus. 



Abdomen, except some black blotches on dorsal segments three, 

 four and five, entirely reddish; the first four abdominal seg- 

 ments with silvery pile at apex distinctus var. 



3 — First joint of fore tarsi much contracted basally, apical portion of 



first three abdominal segments silvery contractus. 



First joint of fore tarsi not contracted .4 



4 — First two dorsal segments of abdomen, apically, silvery; legs, ex- 

 cept tarsi, black, the tibiae with dense silvery pubescence; 



metanotum distinctly punctured aurulentus. 



First four or five segments silvery . . 5 



5— Space between eyes at top about equal to length of joints 2 and 3 



of antennae united 6 



Space between eyes at top greater than length of joints of the an- 



tennse 2 and 3 united 7 



6 — Abdomen reddish, or red and black; hind tibiie armed outwardly 



with a series of short, black, stout and blunt thorns 



abdomi nails. 



Abdomen black; posterior tibiae armed outwardly with a series of 

 whitish, long and rather acute thorns sericatus. 



