6 



PROCEEDINGS OF THE NATIONAL MUSEUM 



Abdomen about twice as long as wide; pleural spines not stout 

 but somewhat setalike; last tergite of female, which forms the 

 posterior margin of the body, with a fringe of very closely set, 

 subequal setae. 



Legs rather long for the genus; first pair of femora longer than 

 broad; last femora considerably longer than the middle pair, and 

 each patch of setae extending for over two-thirds the length of the 

 segment. 



Length of female, 2.75 mm. ; width, 1.30 mm. 



Type host. — A swift, Micropus andecola. 



Type {holotype) .—Qd^t. No. 42761, U.S.N.M. 



F'iGUEE 2. DeNNTDS (DeNNTDS) A0STr.ALIS, NEW SPECIES. 



DoKSAL VIEW OF HEAD AND PROTHORAx, X 60. (Drawn by 

 Dr. E. A. Chapin) 



Described from a single female taken from the type host at 

 Potrerillos, Mendoza, Argentina, March 18, 1921 (A. W. No. 6245), 

 by Dr. A. Wetmore. This species is closely related to D. dubius 

 Kellogg, but has the head differently shaped and has a different 

 prosternal plate. 



DENNYUS (DENNYUS) DUBIUS (Kellogg) 



Head of typical shape for the genus but varying much in regard 

 to the development of the lateral angles on the forehead. These 

 may be wanting, as shown in Figure 3, or they may be as well de- 

 veloped as in D. australis. Posterior angles of temples pronounced ; 

 eyes with double, and usually partly fused, corneas; occipital setae 

 about two-thirds as long as prothorax. 



Prothorax typical in shape, with well-developed lateral pronotal 

 lobes, each bearing a long seta and two spines ; middle pair of pos- 



