A NEW KOENENIA PKOM TEXAS. 227 



B. Lung-sacs absent from the ventral surface of 

 the fourth, fifth, and sixth segments of the abdomen. 



Eukoenenia. 



3. " On the ventral surface, a group of five or six spine-like 

 setae on the fourth segment, and a protruding wart with six 

 procurved setfe on the sixth segment. '^ Two slightly curved, 

 transverse rows of five and six sette respectively are present 

 on the sternum of the cephalothorax. The three setae of the 

 proximal joint of the chelicerae are all of different lengths, the 

 most distal one being decidedly the longest. Labrum more 

 rounded, with five pairs of lip hairs. One lateral sense-organ 

 present on a side. The hollow seta of the third metatarsus 

 of the last leg is inserted at the middle of the joint. 



Koenenia (Eukoenenia) mirabilis. Grassi. 



4. Fourth segment of the abdomen has on its ventral side 

 one seta on each side of the mid-ventral line, while the fifth 

 and sixth segments have two setae on a side. Three cephalo- 

 thoracic sternal hairs are present arranged in a transverse 

 row. A group of three lateral sense-organs are present on a 

 side. The stiff hollow seta is inserted near the base of the 

 third metatarsus of the first leg. 



Koenenia (Eukoenenia) angusta. Hansen. 



5. Ventral surfaces of the fourth, fifth, and sixth segments 

 of the abdomen have, on each side of the mid-ventral line, 

 two setae. Seven cephalothoracic sternal hairs are present, 

 arranged in two intersecting diagonal rows. A group of 

 three lateral sense-organs is present on a side. The stiff, 

 hollow seta is inserted at the middle on the third metatarsus 

 of the first leg. 



Koenenia (Eukoenenia) siamensis. Hansen. 



6. Ventral surfaces of the fourth, fifth, and sixth segments 

 have on each side of the mid-ventral line a group of four 

 hairs. The cephalothoracic sternal hairs consist of five, 



