A NEW KOENENIA FROM TEXAS. 217 



not a single male had been taken up to the present time. 

 This seemed all the more remarkable, since in the other Texan 

 species (K. wheeleri) the males at times predominate. 



Koenenia florencias, n. sp. 



In size K. florencice measures from 2 to 2*3 mm. In its 

 proportions it is not unlike K. wheeleri. 



Cep halo thorax. — The labrum presents a laterally com- 

 pressed condition, and viewed from the ventral or dorsal 

 surface, appears to terminate in a peak. Five pairs of labral 

 hairs are present. These hairs are as prominent as the cor- 

 responding ones in K. mirabilis, and twice as prominent as 

 those of K. wheeleri, where they might be easily over- 

 looked. The hypostome presents the usual cross-furrowed 

 appearance, resulting from the arrangement of the delicate 

 hairs of that region. The frontal sense-organ is of normal 

 appearance, projecting forward from under the blunt-pointed 

 carapace. The lateral sense-organs consist of three pairs of 

 spindle-shaped hairs with the proximal ends blunted at their 

 point of attachment. These sensory setse are six times as 

 long as they are broad at their broadest axis, and are dotted 

 over with delicate hairs. They lie close to the head, and 

 point forward and inward, arising in such a manner that 

 when seen from above they can hardly be counted, so nearly 

 do they lie in the same dorso-ventral plane. When seen 

 from the side they stand out with great distinctness. The 

 number and arrangement of the dorsal hairs of the cephalo- 

 thoi'ax are not characteristic of the species, inasmuch as the 

 same arrangement is met with in K. wheeleri. There are 

 five cross-rows of hairs ; the first consisting of one pair, the 

 second, third, and fifth, each of two pairs, and the fourth of 

 three pairs of setae. The number and arrangement of cephalo- 

 thoracic sternal hairs are characteristic of the species. In 

 every specimen examined for this purpose except one, which 

 had six, five prominent setae are present. These arise in a 

 slightly curved line, which extends over about a third of the 



