432 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 43. 



Length, 2^ mm. 



Type.— C&t. No. 14829, U.S.N.M. 



One male Cabima, Panama, May 18, 1911 (A. Busck). 



1 have named this species in honor of Mr. F. Knab, to whom I am 

 indebted for many kindnesses and assistance in my work here, and 

 who turned over this specimen to me for determination. 



DOHRNIPHORA INCISURALIS Loew. 



A very distinct, large species, represented in the collection by two 

 specimens. Its yellow color separates it from any of the foregoing, 

 and the hind tibial setulse from venusta Coquillett. 



Localities. — Tifton, Georgia, Oct. 17, 1896; and Great Falls, Vir- 

 ginia, June 25, 1909. Two specimens occurred at Plummers Island, 

 Maryland, August, 1912 (H. S. Barber), and one male September 1, 

 1912, Hyattsville, Maryland (Malloch and Knab). 



DOHRNIPHORA VENUSTA Coquillett. 



This species was described by Coquillett,^ and the rather defective 

 description evidently misled Al-drich into describing it as new imder 

 the name divaricata,^ or possibly he had not then seen the description. 

 Later Brues incorporated the species in his Monograph,' without 

 having seen the specimen, and simply copied Coquillett's description. 

 Fortunately the type is still in existence and I have no hesitation in 

 deciding that it is identical with divaricata Aldrich. Had the type 

 not existed there would, I am afraid, have been another unrecog- 

 nizable species, added to the already large number in this family. 

 Its yellow color separates it from the first five species, and the small 

 size of*the anterior pair of scutellar bristles, and absence of any 

 setulse on the anterior surface of the hind tibia separate it from any 

 of its congeners except Icnabi. 



From a large number of localities. 



Type. — Boston, Massachusetts (a male and not female as described 

 by Coquillett); Washington, District of Columbia; bred from cow 

 peas (Chittenden); St. Vincent, West Indies (the types of Aldrich's 

 divaricata); Florida (Mrs. Slosson); Brownsville, Texas (Barber); 

 Orlando, Florida (Chittenden, Russell collector); Grenada and 

 Trinidad, West Indies (A. Busck) ; and several \vithout locality labels. 



DOHRNIPHORA VENUSTA, var. BUSCKI, new variety. 



This variety has the thorax and abdomen black brown, the face 

 brown, the arista more distinctly pubescent than type and the 

 halteres brown. There is not enough material to decide whether it 



> Can. Ent., vol. 27, 1895, p. 107. ' Trans. Amer. Ent. Soc., vol. 29. 



* Trans. Ent. Soc. London, pt. 3, 1896, p. 437. 



