218 PROCEEDINGS OF THE ACADEMY OF [Julie, 



Lake Worth, Fla. ; (Slosson) ; 1 9 , 2 n. [Scudder Collection.] ; 

 1 d* . [Hebard Collection.] 



Miami, Fla.; February 6, 1904; (H.) ; 1 d 1 (Type). [Hebard 

 Collection.]; (Slosson); 1 n. [Scudder Collection.] 



Long Key, Fla.; March 13, 1910; (H.); 1 9. [Hebard Col- 

 lection.] 



Key West, Fla.; March 15, 16, 1910; (H.); 4^,7 9 , 3 & n. 44 



OLIGACANTHOPUS 4 ' new genus. 



1905. Mogoplistes Rehn and Hebard (not of Serville, 1839), Proc. Acad. 

 Nat. Sci. Phila., 1905, p. 4. 



Genus monotypic. Genotype — Oligacanthopus prograptus, n. sp. 



This genus, known from a single female, is widely separated from 

 all others of the group. In some respects a relationship, or develop- 

 ment along similar lines to Glaphyropus, is apparent; this is shown in 

 "he compact build, rounded head, small eyes, broadly rounded and 

 but little produced interantennal space, which is not divided by a 

 vertical sulcus, and similar caudal femora. 



With these characters, however, similarity to Glaphyropus ceases 

 and we find, instead, a close relationship to Cycloptilum in the follow- 

 ing respects: maxillary palpi very much like those found in Cyclopti- 

 lum, cephalic and median limbs also similar, very different from the 

 elongate type found in Glaphyropus; ovipositor of the type of Cyclopti- 

 lum, but somewhat arcuato-convex and differing from all other known 

 North American members of the group in having the ventral margins 

 of the apex armed distad with a row of minute but true serrulations ; 

 cerci of the type found in Cycloptilum, caudal tarsi even shorter and 

 proportionally heavier ; armament of limbs of the same type as found 

 in Cycloptilum but reduced in size to an extreme degree; the metatarsi 

 are proportionally very long, nearly intermediate between Glaphy- 

 ropus and Cycloptilum, but more closely approaching the former, the 

 dorsal margins armed with serrulations similar to those of Cycloptilum, 

 but so fine that they apparent only in a good light under a microscope. 

 Consequently we see that the caudal limbs are most peculiar in 

 having proportions and armament differing strikingly from any 

 other known species; the caudal femora are elongate and not at all 

 flea-like, the tarsi are very short, quite heavy and armed with minute 

 distal spurs, while the metatarsi are proportionally very long and 

 slender, their dorsal margins so finely serrate that these could almost 



be termed unarmed and their terminal spurs minute. 



*. 



44 These specimens are distributed as follows: lcf, 3 9, 3 9 n., Hebard Col- 

 lection; lo%2 9, A. N. S. P.; ld\ 1 9 , U. S. N.M.; lo\ 1 9 , Mus. Comp. Zool. 



4b From b'/jyoc, small, anavOa, thorn, and Kovg, feet; in allusion to the very 

 small tarsal spurs. 



