NO. 2130. NORTH AMERICA RHAPHIDOPIIORINAE—CAUDELL. 665 



forms treated. A modern worker with the material of the larger 

 American collections assembled temporarily before him for study of 

 types and other authentic specimens might succeed in constructing 

 a functional key. The following characters seem promising for use 

 in a task such as the above: Structure of the vertex, whether flat or 

 conical; structure of the cerci of the male, which in a few species are 

 very remarkable (fig. 10) ; the structure of the subgenital plate of the 

 male, the presence or absence of subgenital styles; the ovipositor, 

 whether the inner valves are armed ventraUy with more or less slender 

 sub apical teeth and furnished at the tip with an apical hook, or with- 

 out apical hook and unarmed ventrally or furnished only with trian- 

 gular serrations or undulations; the second segment of the hind tarsus, 

 whether longer or shorter than the depths. A Mexican species, C. 

 macropus Rehn, has the basal three segments of the posterior tarsi 

 prolonged posteriorly above as a distinct spine-hke projection. 



The few species of CeuthopMlus in which the second segment of the 

 hind tarsus is barely or no longer than deep, occasionally probably 

 even slightly shorter than deep, are separable from the species of the 

 genus Phrixocnemis only by the presence of several small teeth be- 

 tween each pair of large dorsal spurs of the hind tibiae. 



The type of Machamala Walker, in the British Museum, has been 

 examined and found to be a true CeuthopMlus. Kirby was evidently 

 correct in relegating this species to the synonymy under CeutJiophilus 

 maculatus Harris, the type of CeuthopMlus. 



Following are remarks on the synonymy, etc., of some of our native 

 species of this genus : 



CEUTHOPHILUS NEOMEXICANUS Scudder. 



The male specimen in the collection of the United States National 

 Museimi selected as (;he holotype of this species by Rehn and Hebard ^ 

 is a member of the genus Phrixocnemis as used in the present paper, 

 and is therefore included in that genus. The female specimen in 

 the same collection, the only specimen of that sex included in the 

 original description and therefore the allotype, is not congeneric 

 with the holotype but is a true Ceuthophilus. If it is a distinct 

 species or a snynonym of another, is an unsolved question. It has 

 five or more serrations between the dorsal spurs of the posterior 

 tibiae and the second segment of the hind tarsus is distinctly longer 

 than deep except in the left leg, which is deformed, where it is about 

 as long as deep. 



CEUTHOPHILUS VINCULATUS Scudder. 



This species is very close to calif ornianus. The types have been 

 examined and material of both species, named by Scudder, are in 

 the collection of the United States National Museum, The character 

 used as diagnostic by Scudder, th^ presence or absence of raised 



> Proc. Acad. Nat. Sci. Philad., 1912, p. 72. 



