May, '09] 



ENTOMOLOGICAL NE\YS. 



197 



Notes and Descriptions of Wasps of Genus Tachytes. 

 BY S. A. ROHWER, Boulder, Colorado. 



Before proceeding I wish to thank Rev. G. Birkmann of 

 Fedor, Texas ; Mr. C. T. Brues of the Public Museum of 

 Milwaukee, and Prof. C. P. Gillette of the Colorado Agricul- 

 tural College for supplying most of the material upon which 

 this paper is founded. Unless otherwise stated, the types of 

 the new species described herein are in the author's collection. 



In my work on this genus I have found the color of the pu- 

 bescence on the pygidium of the female to be constant and of 

 service in separating species. The species of Boreal North 

 America may be grouped as follows : (the females of spatula- 

 tus Fox, parvus Fox, exornatus Fox and basirufus Roh. are 

 unknown) : 



SILVERY Section i. 



validus Cress. 

 harpax Patt. 

 breviventris Cress. 



Section 2. 

 mergus Fox. 



GOLDEN Section i. 

 calcaratits Fox. 

 calcaratifonnts Roh. 

 praedator Foh. 

 dub it at us Roh. 

 columbiae Fox. 



Section 2. 



rufofasciatus Cress. 

 obductus F"ox. 

 birkmanni Roh. 



BRONZY Section i. 



mandibularis Cress. 

 fulviventris Cress. 

 crassus Patt. 

 pepticus Say. 

 propinquus Roh. 



Section 2. 



aurulentus Fabr. 

 contractus Fox (?) 

 distinctus Sm. 

 sericatus Cress. 

 abdominalis Say. 

 obscurus Cress. 



Tachytes basirufus n. sp. 



(J 1 . Length n mm.; length of anterior wing 9 mm. Anterior margin 

 of the clypeus broadly produced in the middle, with a small side tooth ; 

 the process slightly emarginate in the middle ; surface of clypeus rather 

 coarsely punctured. Vertex finely closely punctured ; the impressed line 

 distinct, but not strong. Space between the eyes at the top a little less 

 than the length of antennal joints 3 + 4. Antennal joints 3 and 4 of equal 

 length, somewhat narrowed towards the base ; apical antennal joints sim- 

 ple. Dorsulum punctured like the vertex. Scutellum a little more 

 sparsely punctured than the dorsulum ; not impressed. Metanotum 

 granular, middle line not strong ; fovea at apical middle distinct, trans- 

 versed by a small carina. Posterior face of metathorax finely, transversly 

 striated ; middle line distinct. Venation normal. Fore coxae and femora 



