JAMES A. G. REHN 323 



width of the plate; lateral supra-cereal emarginations of the plate decided, the 

 median portion trapezoidal, the distal margin sinuato-truncate, the lateral 

 angles of the same broadly rounding into the lateral margins of that area: 

 cerci broad, depressed fusiform, the apex moderately acute, in length surpass- 

 ing the margin of the supra-anal plate by about two-thirds the length of the 

 latter: subgenital plate strongly transverse, the portion between the styles 

 somewhat produced distad of the insertion of the styles and broadly truncate 

 with the lateral angles rounded obtuse-aiigulate; styles elongate, simple, taper- 

 ing. 



Cephalic femora with the ventro-cephalic margin bearing a regular series of 

 spines except proximad. Median femora with both ventral margins regularly 

 and strongly spined; median tibiae subdcpressed ; median tarsi with the met- 

 atarsus distinctly shorter than the remaining joints together. Caudal femora 

 with the armament of the margins as in the median limbs; caudal tibiae de- 

 pressed, elongate subfusiform in general outline, the surface of the dorsal and 

 of the ventral faces with a broad, longitudinal impressed area of a general 

 boat-shaped character; caudal tarsi elongate, the metatarsus almost subequal 

 in length to the remainder of the tarsus. 



Allotype. — 9 ; Tablazo, Costa Rica. Elevation, 1900 meters. 

 September, 1906. (J. F. Tristan.) [Acad. Nat. Sci. Phila.] 



Differing from the description of the male in the following features. General 

 form with the abdomen faintly broader in proportion than in the male. .\b- 

 domen with the caudo-lateral angles of the dista-dorsal segments more pro- 

 duced than in the male. Supra-anal plate subtrigonal in general form, mod- 

 erately projecting, faintly rostrate, tectate distad, the dorsal surface there 

 briefly subcarinate; converging lateral margins of the plate appreciably con- 

 cave proximad, the distal portion of the margin broadly V-emarginate, this 

 rounding laterad into the lateral margins proper: cerci depressed broad-fusi- 

 form, in length reaching to the extremities of the subgenital valves, apices 

 acute: subgenital plate verj^ ample, the valvate portion occupying slightly more 

 than half the length of the pLite, basal suture of the valves occupying about 

 one-half the entire width of the plate. Caudal tibiae moderately depressed, 

 not at all expanded as in the male and without impres.sed areas on the dorsal 

 and ventral faces. 



General color varying from hessian brown to pitch black, in the paler indi- 

 viduals the thoracic and abdominal segments, the coxae and the tegniina nar- 

 rowly edged with pitch black; apex of the abdomen entirely or largely pitch 

 l)lack in those which show any color contrasts, the subgenital and supra-anal 

 plates of the male sex lined on the distal margin, and the cerci of both se.xes 

 tipped with ochraceous, this latter coloration varying to a certain degree. 

 Distal tarsal joint of all tarsi, the arolium and claws of the same with the base 

 color ochraceous-orange, the extremity of the joint, and to a less decided or 

 constant degree the arolium and claws, infuscate. 



TRANS. AM. ENT. SOC, XLIV. 



