264 



KANSAS UNIVERSITY QUARTERLY. 



In Entom. Amer., II, p. 106, I described a new genus of Leptidae 

 under the name Agnoio/nyia, based upon the presence of but four 

 posterior cells in tlie wing and of but one anterior- tibial spur. 

 The species upon which the genus was founded was the long-lost 

 Lo7natia elongata of Wiedemann, which had previously been placed 

 among the Bombyliidae. Another species agreeing in these characters 

 was known to me at the time, but I did not describe it. With 

 the knowledge of the fact that T. rufithorax has but a single spur, 

 and the vein of the wing separating the fourth and fifth posterior 

 cells often incomplete, Townsend rightly came to the conclusion that 

 the two genera were less certainly distinct than had seemed to be the 

 case. 



Within the past few months. Prof. Aldrich has very kindly sub- 

 mitted to me another species with a single spur and with five posterior 

 cells. Wishing to ascertain further in regard to the type of Dialysis, 

 I wrote to Mr. Austen of the British Museum for information 

 especially concerning this character. Mr. Austen, with great kind- 

 ness, has written me the following in reply: "There is only one spur 

 on the front tibise of the type specimen of Walker's Dialysis dissimi- 

 lis. I am astonished to find, however, that there are only four 

 posterior cells in the wing, as seen in the accompanying drawing. 



Fig 1. 



This extraordinary venation seems to have escaped the notice of 

 Baron Osten Sacken, when he examined the specimen. The two wings 

 are exactly alike and there is no stump or other trace of the missing 

 vein in either of them. In other respects the specimen is a Leptid 

 and agrees generally with the description of Triptotricha fasciventris 

 Loew. The abdomen agrees absolutely with Loew's description. In 

 other respects there are the following differences: Third joint of the 

 antennae and the arista blackish; I cannot detect any trace of black 

 hairs on the first two joints; thorax with a reddish brown median 

 stripe, extending to the base of the scutellum, but not quite reaching 

 the anterior margin; humeri shimmering whitish when viewed from 

 above; front and middle tarsi uniformly brown, first joint not paler; 

 first and second joints of hind tarsi yellowish, but brown at the tips. 



