44 The Graspedosomatidse of North America. 



Antennae filiform, 3 mm. long, .16 mm. thick. 



Male genitalia (figs. 138, 139, 145-148, 150), with the anterior and larger 

 arm bent abruptly candacl (or dorsad). At apex it is more or less bifid, with 

 the outer lolje longer, so that seen from below the end appears either more or 

 less truncate, or if the animal is tilted so as to look more directly at the apical 

 portion of the genitalia the appearance is that of figures 139 and 146. This 

 last is somewhat of a side view as Avell. The longer lobe is at apex more or 

 less fimbriate on the posterior side. 



Posterior arm of genitalium clavate, the apex curved toward the anterior 

 arm. The shape will be seen to vary considerably in the three figures 138, 

 147, 150; from the explanation of plates it will be seen that the figures are 

 from different localities, and further study may necessitate another disposition 

 of the different forms. 



Ninth legs of male (figs. 144-145) with basal joint moderately emar- 

 ginate on the A^entral side, near the base; toward the apex, on the same side, is 

 a sharp tubercle directed distad. Second joint nearly half as broad as long, the 

 greatest diameter at about two-thirds of its length, gradually narrower below, 

 more abruptly so above. Three distal joints small, together equal in length 

 to about half the second joint. Last joint nearly equal in length to the two 

 preceding, constricted above the middle and obliquely crossed on the an- 

 terior side, just below the constriction, by an oblique ridge the edge of which 

 is sharp and spinose-laciniate, giving the appearance of another joint. Two 

 proximal joints with few hairs, the three distal increasingly hirsute. Claw 

 nearly normal, one evident supjilementary claw. 



Color of alcoholic specimens: Head dark brown, lighter above ; the man- 

 dibulary stiises areolate, pale lines separating darker areas; antennae dark 

 brown. 



Body usually with a yellowish median longitudinal line of greater or less 

 width, on each side of which is a usually broader dark line, below this a nar- 

 nower yellow one, and then another dark line or longitudinal row of dark 

 spots. Ventral surface yellow, legs pallid, or the distal joints dark. On each seg- 

 ment the brown color is much darker on the posterior subsegments ; that of the 

 anterior iDortion has sometimes a bluish tinge. The median yellow line is fre- 

 quently obsolete, and the lateral reduced to a row of transversely oblong 

 spots. In the dorsal dark lines there are, on each segment, two longitudinally 

 oval or circular small yellow spots, in which the small bristle-bearing pro- 

 tuberances are located. Even when the lateral yellow line is present there is, 

 below the outer of these spots a brighter, longitudinally oval spot. The 

 lateral bristle-bearing protuberance is located in the upper part of the lateral 

 dark line and is colored yellow. Length 14-16 mm; width 1.5. 



Habitat: In the XJ. S. Nat. Museum are the following 

 numbers Isibeled GampodesJlavicornis'by'BoWma.n. While there 

 was supposed to be but one species in the genus determination 

 was comparatively easy, but it is now impossible to assign speci- 

 mens to the different species without a dissection or at least a 



