1893.] NATURAL, SCIENCES OF PHILADELPHIA. 475 



11.— T. tridentatum Pack. 



T. tridentatum Pack., 1. c. p. 417, 9 . Fox, 1. c. p. 144. 9 $ . pi. Ill, f. 4. 



Occurs throughout the United States. 



12. — T. rufozonale Fox. 



T. rufozonalis Fox., 1. c. p. 145, 9 $ pi. Ill, f. 3. 



Colorado ; Piedmont, So. Dakota (Aldrich). 



13. — T. arizonense Fox. 



T. arizonense Fox., 1. e. p. 145, 9 , pi. Ill, f. 13. 



Arizona. 



14. — T. californicum Sauss. 



T. californicum Sauss., Eeise d. No vara, Zool. II, 1867, p. 78, 9 . 



Closely related to arizonense, but may be distinguished by its 

 stouter form, the greater extent of red on abdomen, and by the char- 

 acters given in the synoptical table. Length 16 mm,, somewhat 

 larger than the size indicated by Saussure. 



15. — T. spinosum Cam. 



T. spinosa Cam., Biol. Centr. Amer.,Hym. II, p. 46, pi. 4, figs. 8, 8a., 8b. $ . 

 T. spinosum Fox, 1. c. p. 145. 



Texas and Mexico. 



16.— T. texense Sauss. 



T. texense Sauss., 1. c. p. 77, 9 ; Fox, 1. c. p., 146. 9 $ . 



Texas ; Las Cruces. N. Mexico (Cockerell). 



17.— T. collinura Sm. 



T. collinum Sm., 1. c. p. 381. 9 ; Pack. 1. c. p. 415. 9 $ . 



Florida. 



18. — T. carinatum Say. 



T. carinatus Say., Bost. Jour. I, p. 374 $ . 

 T. carinatum Fox, 1. c. p. 147. 



9 • — Antenna long, a little thickened apically, the third and 



fourth joints about equal in length ; front strongly convex, with a Y- 



shaped carina as in the $ ; space between eyes at vertex, if anything 



a little greater than the length of antennal joints three and four 



united ; anterior margin of the clypeus rounded, entire ; abdomen 



stout, the first segment but little longer than the second, scarcely 



nodose at apex and furrowed above on basal portion ; black ; base of 



four hind tibiae and the medial tarsi, testaceous ; fore-legs ; 



tibial spurs whitish ; face, clypeus, cheeks and thorax more or less, 



clothed with silvery pubescence ; abdomen with a sparse silvery pile. 



Length 8? mm. 



Indiana (Say); Philadelphia, Penn. (July 14th, 1891.) 



19.— Trypoxylon Johnsonii Fox. 



T. Johnsoni Fox, 1. c. p. 147. 9 . 



Florida ; Texas. 



