NO. 1361. RE VISION OF A MERICAN SIPHON AFTER A— BAKER. 421 



CTENOPHTHALMUS GIGAS (Kirby). 



The attempt to employ this name, based as it was on an unrecog- 

 nizahle dosci-iption, was perhaps unwise. At the time it was done 

 some Canadian and Nortiiern United States Heas were in the collection, 

 and this was the only one which at all fitted the original description as 

 to size. It was collected by myself at Ao-ricultural Colleoe, Michigan, 

 on Lepus. Later, two northern species of Ily.sfr/c/top.syUa came to 

 hand, either of which might have been referred to under this name 

 with equal propriety, so far as the description is concerned. Only an 

 examination of the type can settle the matter, and this may still he in 

 existence in the British Museum. Jn the meantunc the matter will 

 be allowed to stand just as it is in order to avoid any additional con- 

 fusion. In addition to the characters given in the first d(\scription, 

 the following- may l)e noted: 



Female: The upper and lower rows of genal ))ristles are continued 

 obliiiuely on to the vertex in the manner so characteristic of this 

 genus — on the vertex about six bristles occurring above and al)out 

 eight l)eIow. A pigmented eye is wholly wanting. Hind margin of 

 antennal groove with a single row of small hairs. 



The pronotum has two rows of bristles, and the meso- and metanotum 

 three or four each. The tirst and second abdominal tergites each ha\e 

 two small teeth on either side, and the third one on either side. End 

 of abdomen very heavily bristled. Antepygidial bristles three on each 

 side and very large, the middle one in each set longest. 



Stjde long and slender, about three times as long as wide at base, 

 nearly cylindrical, with a long bristle at apex, and just back of this 

 two minute ones. The fourth pair of spines on last joint of hind tarsi 

 are al)orted, so that there are onlv four pairs of well-dexeloped spines, 

 as in Pulex. 



CTENOPHTHALMUS PSEUDAGYRTES, new species. 



Plate XI, figs. 7-12. 



Although in the Preliminary Studies this s})ecies was referred to 

 a varietal form of ass! mil is, yet later it became a very dou])tful refer- 

 ence. The appearance of Rothschihrs study of the European nijijiies 

 confirmed the suspicions as to its distinctness. It ditters from agyrtes 

 more especially in the armature of the first joint of the hind tarsi and 

 in the genitalia. Specimens are now in the collection from Gtoiiujx 

 hursarius at Agricultural College, Michigan (Baker), from Svalopx 

 argenfatu.s at Ames, Iowa (Osborn), from nest of field mouse at Ithaca. 

 New York (MacGillivray). and from Jfy/ascops a.sio at Welleslcy. 

 Massachusetts (Morse). Thc^ last-mentioiunl occurrenc(> is to t)e con- 

 sidered as wholly accidental. The Michigan specimens are taken as 

 lyi)es. 



