The Craspedosomatidse of North America. 63 



The species of Trichopetalum which we have studied have the 

 ninth legs of the male (Fig. 48), apparently exactly alike. They 

 differ from those of Zygonopus in being somewhat clavate, in- 

 stead of obclavate. 



The fifth joint of the antennae is equal to or longer than the 

 third in this genus, Z^^gonopus and Underwoodia, while in all 

 other American species of the famil^^ the fifth is shorter than the 

 third, neA'^er bearing a greater ratio to it than 8.5 : 10. In this 

 species, too, the foui'th joint is about half the length of the fifth, 

 while in Conotyla the fourth and fifth are subequal. 



We are acquainted with three species falling under this genus, 

 as here characterized. The original description of Trichopetalum 

 lunatum gives no characters not common to all three, but the fig- 

 ure of the genitalia, on the other hand, does not bear any close 

 resemblance to those of either of the species known to us, al- 

 though it is possible to imagine it as having been made from 

 either of them. It is thus impossible, without a study of his 

 type, to know which of our species, if any, was described by Har- 

 ger. Under these circumstances it would seem that the course 

 least likely to cause confusion is to describe our three species 

 new, giving figures of the genitalia, so that when the t^^pe of 

 T. lunatum is studied a definite conclusion ma3^ be facilitated 

 and the specific name not misapplied. 



Tricbopetaliim lunatum Harger. 



Trichopetalum lunatum Harger: Am. Journ. Sci. and Arts, IV, p. 118 (1872); 



Eyder: Proc. U. S. Nat. Mxis., V, 527 (1882); Packard, Proc. Am. 



Philos. Soc. XXI, 192 (1883); McNeill, Bull. No. 3, Brookville Soc. 



8, (1888). 



Scoterpes lunatus EoUman: Proc. TJ. S. Nat. Museum, XI, 405 (1888); 



Bulletin 46 U. S. Nat. Museum, pp. 106 and 121 (1893). 



Plate III, figures 52-54. 



" Dirty white, banded transversely and mottled with light brown anteriorly. 



Segments 28; males with 45, females with 46 pairs of legs. Head large, 



dilated laterally, covered with short, erect, bristly hairs. Eyes of 10 ocelli, 



in a lunate group, convex toward the bases of the antennae. Antennae pilose, 



seven-jointed; the joints measure, the first .07 mm., second. 10 mm., third .23 



mm., fourth .11 mm., fifth .22 mm., sixth .09 mm., seventh .07 mm. First 



scutum nearly semicircular, with the posterior margin slightly concave. Near 



the outer angles of this scutum are two small tubercles on each side, each 



bearing a stout bristle, and higher up a third tubercle on each side also bears 



a bristle. The remaining scuta throughout are furnished with three bristles 



