54 The Graspedosomatidse of North America. 



tropus also differs from the genera mentioned in the number and 

 shape of the joints of the ninth legs, the slight development of 

 carinae, tubercles, and bristles, and in the want of a distinct pro- 

 mentum. 



Bactropus conifer sp. n. 



Plate IX, figures 172-176. 



Body tapering more gradually behind than in Cleidogona. 



Vertex slightly rugulose, sparsely hirsute, sulcus indistinct. 



Eyes triangular, arranged in six rows, beginning posteriorly, 7-|-6-|-5-|-4-|- 

 34-2=27. 



Antennse slighly clavate, approximate ratio of lengths of joints, beginning 

 with the seventh, 3, 4, 9, 5, 10, 4, 1. 



First segment rugulose, semi-circular, the tubercles very nearly obsolete. 

 The furrow in which the dorsal ridge is situated runs nearly, if not quite 

 to the anterior margin. 



Subsequent segments slightly rugulose, anterior portions finely reticulated, 

 carinse small, tubercles and hairs very small and indistinct. Pc sterior margin, 

 gently sinuate on each side behind the outer setigerous tubercles. 



Last segment, anal valves and preanal scale (fig. 176'! much as in Cleidogona. 



Male genitalia (fig. 174) simple, with broad base and attenuate apex,^ 

 curved backward. 



Ninth legs of male (figs. 174 and 175) with a few hairs on the two proxi- 

 mal joints; the claw very small. 



Color dark brown, the posterior margin of each segment and a very fine 

 median line yellowish. A light spot at each setigerous tubercle, the outer 

 two spots on each side subconfluent, giving the appearance of a light longi- 

 tudinal line. Ventral parts and basal joints of feet dirty brown; apical joints 

 darker. Antennse nearly black, darker than those of any other species known 

 to us. 



Length about 9 mm. 



Habitat : Indiana. We have examined one male and three 

 female specimens collected by BoUman in the vicinitj^ of Bloom- 

 ington, and deposited in the National Museum (No. 43; under 

 the name " Craspedosoma lunatum.'''' 



The material is in poor condition so that many important 

 facts cannot be determined. Further study will probably multi- 

 ply minor similarities with Cleidogona. 



The joints of the ninth legs of male are not, in the specimen ex- 

 amined, easy to distinguish, the second, third and fourth appear- 

 ing nearly coalesced. This suggests the idea that the second 

 joint of the ninth leg of Scoterpes, Trichopetalum, Zygonopus 

 and Conotyla may have been formed by the gradual coalescence 



