AET. 20 TAXONOMY OF BITHsTG LICE EWING \f 



Subgenus Ctenodennyus, new subgenus 



In addition to the characters of the subgenus Ctenodennyus given 

 in the key to the subgenera of Demiyus, some others of minor impor- 

 tance should be added. The head is broader than in the typical 

 subgenus, and the posterior angles of the temples are much reduced. 

 The inflation of the anterior femora is so pronounced that these 

 segments are much broader than long, also the second and third 

 femora are inflated along the dorso-distal aspect, the expansion ex- 

 tending beyond the tibio-femoral articulation as a cusp. 



Type species. — G. spiniger, new species. 



Only the type species included. It was taken from a swift, 

 Cypseloides niger horealis. This is the first record, apparently, of a 

 species of Dennyus from a swift of the genus Cypseloides. The host 

 was taken at Seattle, Wash. It will be interesting to see what kind 

 of lice the South American representatives of Cypseloides have. 



DENNYUS (CTENODENNYUS) SPINIGEK, new species 



Head broader than usual, with pronounced anterior angles on 

 temporal lobes; eyes single and poorly pigmented; fringe of setae 

 on posterior margin of ocular emargination • pronounced. Above, 

 the head bears six pairs of pigmented, peglike spines, four of which 

 are discal and two of which are marginal on temporal lobes. 



Prothorax slender, longer than broad; pronotal expansions not 

 conspicuous, each bearing two peglike spines and a long seta. There 

 is an additional pair of peglike setae on the pronotum near the middle 

 of the same. Posterior marginal setae of pronotum subequal. Pros- 

 ternal plate with very heavy margins and 10 peglike spines situated 

 on the central hyaline area. 



Mesothorax about twice as broad as long and separated from meta- 

 thorax dorsally by an indistinct suture; dorsally it bears a minute 

 pair of discal setae and on each shoulder three sharp, slightly curved 

 spines. 



Metathorax over twice as broad as long. Of the three pairs of 

 dorsal discal setae the antero-lateral pair only is setalike, the other 

 two being peglike. ■■ Of the posterior marginal setae there is a group 

 of three (the most lateral ones) that are peglike and a pair of two 

 sublateral peglike ones. 



Abdomen about twice as long as broad ; tergites bare above except 

 for the row of spines and setae on posterior margins. Typically a 

 spine and a seta alternate in these marginal rows, but on the first 

 abdominal segment there are about twice as many spines as setae. 

 The pleural plates bear spines chiefly, there being no tufts of setae. 

 Ventrally the abdomen bears no spines; the patches of setae are sit- 

 uated on the sternites of fifth to seventh segments. 



