350 GEOLOGICAL SURVEY OF THE* TERRITORIES. 



Stkeptocephalus florid anus Packard. 



StreptocepJialus floridanus Packard, American Naturalist, p. 53, Jan. 1880. 



The two basal filaments are as in 8. texanus; of the forceps at the end 

 of the claspers, the filaments are much shorter and smaller than m 

 B. texanus, so much so that there is no need of confounding the two 

 species, and, besides, in the Floridian species the processes are less broad 

 and flat, and the inner of the two blades of the forceps have but one 

 instead of two teeth. It approaches 8. texanus in the robustness of the 

 body, in the form and size of the caudal appendages, which equal, in 

 length, the three last abdominal segments. It seems to approach 

 8. similis Baird, which inhabits St. Domingo, but that species is not 

 described with sufficient exactness to enable us to compare it properly, 

 and indeed without good specimens for comparison it is difficult to say 

 whether this species is ditt'erent or not from 8. sealii Ryder. 



Total length of male, 10™"; length of 2d antennae when stretched 

 out, 5-6"""; length of caudal appendage, 2"™; total length of female, 

 10™". 



A pair, (? and 9 , found in the Saint John's Eiver, Florida, May 23, 

 1879, by Alex. P. Fries; received from Dr. Carl F. Gissler. It appears 

 to differ from ^S'. similis in the shorter filiform appendage of 3d joint of 

 2d antennae, which is also very much shorter than in 8. texanus. 



STREPTOCEPnALUS SIMILIS Baird. 



Strepfocephalus similis Baird, Annals and Mag. Nat. Hist. 2d ser. xiv, 220, 1854. 



" This species, which was found by M. Sall6 in the island of St. Do- 

 mingo in the West Indies, is of a slender and cylindrical form. The male 

 is about five-eighths of an inch in length, and the female half an inch. 

 The inferior antennae or cephalic horns in the male are large and tortu- 

 ous; they are composed of three joints; the first or basal joint is the 

 largest, is cylindrical, and extends for some distance straight forwards; 

 the second, smaller than the basal, is also cylindrical, curves slightly at 

 first, then bends suddenly backwards upon itself; the third or terminal 

 joint bends as suddenly forwards and terminates in a club-shaped ex- 

 tremity, which divides into two branches, one longer than the other, 

 terminating in a long filiform process; the other flatter, shorter, and 

 dividing into two shorter filiform processes of unequal length. The 

 antenniform appendage is long and cylindrical, rather stout, and si)rings 

 from close to the extremity of basal joint. The basal joint is destitute 

 of the lanceolate-toothed appendage on internal edge, which we see in 

 the preceding species {8. cafer Loven). The superior antennae are long 

 and slender, and consist of two joints, the basal one much shorter than 

 the 2d. The male organs are rather long, cyliTidrical, and of a horny 

 texture. The front of the head is prolonged into a beak, which is flat, 

 rather broad and slightly lobed at the extremity. Feet short. Abdo- 

 men slender. Caudal appendages of moderate length, and beset ou 

 each side with numerous short and plumose setae. 



"The cephalic horns in the female are short, thick, and terminate in a 

 short spine at the extremity. The ovarian bag is conical, acute, and 

 the ova are of an ochreous color. 



"The chief differences between this species and /S". cafer consist, in the 

 male, in the shape of the front of the liead, the organs of generation, 

 and in the inferior antennae having no lamina with teeth on the basal 

 joint; in the female, in the shape of the external ovary." 



