JOURNAL 



TEfrfo ]9oFh 6jnforaoIogiral #oripfyj. 



Vol. XIII. JUNE, 1905. No. 2 



Class I, HEXAPODA. 



Order IV, DIPTERA. 



ILLUSTRATIONS OF THE ABDOMINAL APPEN- 

 DAGES OF CERTAIN MOSQUITOES. 



By Harrison G. Dyar, A.M., Ph.D., 

 Washington, D. C. 



(Plates IV and V. ) 



It has been shown by Mr. F. V. Theobald that the male genitalia 

 of mosquitoes are of value for purposes of identification, and Dr. E. 

 P. Felt has inaugurated the use of them in the definition of genera. 

 Previous to Dr. Felt's work the genitalia of our species were little 

 known and but few of them figured. It is the purpose of the present 

 article to illustrate some additional species to those which Dr. Felt 

 has made known. 



Deinocerites cancer Theob. (Plate IV, Fig. I.) 



Side pieces stoutly conic, basal lobe strongly trifid ; clasp thick, 

 truncate, clawed at tip, hirsute on outer aspect. Harpe long, spatu- 

 late, smooth, unjointed. Harpago rounded, concave, crested by 

 stout spines. Uncus slender, concave, nearly as long as the harpago. 

 Appendage of the eighth segment undeveloped. 



Wyeomyia smithii Coq. (Plate IV, Fig. 2.) 



Side piece conic, bent from side view, rather transparent ; two 

 stout setae within ; clasp enlarged, membranous, inflated, irregularly 

 lobed, with a few spines. Harpes and harpagones likewise inflated 



53 



