2i6 EXTOMOLOciCAL NEWS. [.T''-^ne, 'l8 



$. Length 7.5 mm., width 2.7 mm. Very similar to the male; the 

 more yellowish or orange red coloration serves to distinguish the 

 females from those of major in the small series studied. 



Holotypc: $, Austin, Texas (C. T. Brues) ; Cornell Uni- 

 versity Collection. 



Allotype : topotypic. 



Paratypes: 5 9 , topotypic; 9 , May, 1896, Texas (]\Iarlatt). 



Explanation of Plate XIII. 



Male genital claspers of Lopidea. 



A. left clasper, dorsal aspect. B. right clasper, dorsal aspect. C. 

 right clasper, posterior aspect. D. left clasper, posterior aspect. E. 

 right clasper, internal lateral aspect. F. right clasper, external lateral 

 aspect. 



The Larval Stages of Argyra albicans Lw. (Diptera, 



Dolichopodidae). 



By Werner Marchand, Princeton. New Jersey. 



(From the Rockefeller Institute for Medical Research, Department 

 of Animal Pathology). 



While collecting Tabanid larvae by sifting the mud of the 

 edge of a pond, some unknown dipterous larvae were found, 

 which, it was thought at first, might be those of Chrysops. 

 However, when bred, they gave flies of the family Dolichopo- 

 didae. For the determination of the flies I am indebted to 

 Mr. E. T. Cresson, Jr., in Philadelphia, who identified them 

 as Argyra albicans Loew. The species has been recorded for 

 Princeton in Smith's "Insects of New Jersey." 



In the present condition of entomological literature it is 

 practically impossible for anyone who makes occasional ob- 

 servations on a subject, not directly falling within one's own 

 field of research, to ascertain whether such observ^ations are 

 new or not. I publish the following fragmentary notes on the 

 flies in question, in the hope of a future closer co-operation 

 between students of Dipterous life-histories.* 



* According to Malloch's recent paper (1917) a great majority of 

 Dolichopodid larvae are aquatic. Malloch makes no mention of the 

 genus Argyra, but points out the meagerness of our knowledge on 

 early stages of this family. 



