A NEW KOENENIA FROM TEXAS. 219 



upper surface of the metatarsus, a large, hollow, sensory seta, 

 which arises at about the middle of the joint. As would be 

 expected from our knowledge of the other members of this 

 group, K. florenciae has the usual number of seven delicate 

 sensory setae. The first one arises from the outer surface of 

 the patella, one third of the distance from its distal end. The 

 next two arise from the upper and distal limit of the first 

 metatarsus, while the second metatarsal joint bears one on 

 the proximal limit of its upper surface, and one near the 

 middle on the outer surface. The fourth metatarsus and 

 second tarsus each gives off one of these hairs from its upper 

 surface. So far as I am aware no statement has been made 

 in regard to the proportionate length of these delicate organs. 

 In K. florenciaj the uppermost hair of the first metatarsus 

 and the one arising from the second tarsus are only of about 

 half the length of the other metatarsal hairs, while the cor- 

 responding hair of the patella is lacking somewhat in length. 

 Bifurcating hairs are present on the first and second meta- 

 tarsus, and second and third tarsus. Characteristic of the 

 species is the size and the situation of the large, hollow, flat 

 seta of the third metatarsal joint. This seta is situated at 

 about one half of the distance from the proximal end of the 

 joint. It is shorter and narrower than the corresponding- 

 organ in K. whecleri, which arises from the distal end of the 

 joint. In K. f lorencige, on the opposite side of the joint 

 from where the seta arises, is another hollow though round 

 and pointed seta, which is much longer and almost as broad. 

 The Abdomen. — In K. florencias is found the usual belt 

 of setae on all eleven of the segments except the first. It is 

 in the arrangement of these setae that K. florenciae differs 

 from all of the other described species. Along the dorsal and 

 lateral surfaces of the abdomen, a strip, made conspicuous by 

 the absence of setae, extends to the seventh segment. The 

 remaining are regularly adorned with setae at approximately 

 equal distances apart. The most striking differences between 

 the two Texan Koenenia are to be found on the ventral sur- 

 face of the abdomen. No lung-sacs are present in K. 



