﻿12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



Paine, which should be placed in Coloceras,^ inasmuch as it has the 

 same type of antennal dimorphism and male genitalia attributed to 

 that genus. 



The head is typically goniodian in shape, with no outstanding 

 characters except the antennae of the male, the curious structure of 

 the temporal angles, and certain chaetotaxy. The antennae are 

 typical of Colocaras, having the first segment globular, the second 

 almost as long as the first but slightly conical; the third almost as 

 long as the second, with base same thiclaiess as apex of second and 

 with outer side straight and inner side bulging out to form the thick- 

 ened apex; fourth and fifth are minute, foiu-th as thick as tip of third, 

 fifth much smaller. In the female the first segment is globular, but 

 smaller at tip; second is slightly shorter than fu-st with tip thicker 

 than base, while segments 3, 4, and 5 are about half the length of 

 second and almost equal in length; the third being slightly the longest. 



On the temples of both sexes the lateral temporal band is heavily 

 chitinized, extends backward behind the posterior margin of temples 

 (at the angle), and bears at its tip a short, slender spine. Just inside 

 this projection, on the dorsal surface, is the somewhat squarish 

 temporal angle, which bears a very long, thickened hair. 



In the male the large hyaline eye bears a very long, thickened hair, 

 while in the female it bears only an insignificant bristle. The clavi 

 are prominent in both sexes and bear a long, strong hair. The thorax 

 is small, the prothorax being narrow, with sides straight, slightly 

 serrated, and divergent. The pterothorax has rounded sides and 

 round posterior angles and has the posterior margin produced medially 

 into a rounded extension, which bears two long, coarse hahs, while 

 there are two other strong hairs on each side just inside the lateral 

 angle. 



There is little distinctive about the abdominal structm-e, except 

 that segment I is much more deeply pigmented than the remainder. 

 However, the male genitalia as well as the female genital plate are 

 peculiar and characteristic and are figured. The structure of the 

 genitalia is peculiar, but not unique, since it is typical of the genus, 

 and something analogous is found in several species now placed in 

 Goniodes. The parameres (?) are merely elongated extensions of the 

 heavily chitinized bands bordering the basal plate, and the combined 

 structure is longer than the entue abdomen, the base of the basal 

 plate reaching to the middle of the pterothorax. The tips of the 

 parameres are serrated along their inner edge and rugose on the upper 

 surface, while the sac lying between them contains many fairly large 

 Y-shaped spicules. The genitalia proper lie within a thin-walled 



' In my opinion the genus Margaritenes Keler (genotype: Goniodes eurygaster) is a synonym of Coloceras. 

 Also, Goniocotcs chinensis Kellogg and Chapman is very likely a Coloceras; although the male is unknown, 

 the head of the female is very typical of that genus. 



