570 PROCEEDJNaS OF THE NATIONAL MUSEUM. vol. xxvii. 



Sulalainily HARP^^GMlSr^^C. 



Genus ACANTHOPS Serville. 



1831. Armithnps Serville, Ann. Sci. Nat., XXII, p. -53. 



T(/pe. — Middix fnscifolla Olivier = i<lnuat<i Stoll. 



ACANTHOPS TUBERCULATA Saussure. 



1870. ASj:-antho]»(\ tnhercidata Saussure, Bull. Soc. Ent. Suisse, III, p. 243; 

 (iuiana. 



One immature female; Tucurrique, Costa Rica. (Schild and Burg- 

 dorf.) [LT.S.N.M.] 



This species previously has only been recorded from Guiana, As 

 the female is uudescribed, I have made a few remarks on the specimen 

 in hand. 



Size rather large; form depressed, a))domen ver}' broad. Head 

 slightly longer than broad; eyes acute mammillate; vertex truncate; 

 ocelli very small; facial shield transverse, slightly arcuate, the superior 

 margin with the median section subtruncate; antennae filiform, not 

 exceeding half the length of the pronotum. Pronotum of moderate 

 length, collar gradually expanding into the well-rounded supracoxal 

 lobes; shaft with the median portion compressed; margins with no 

 appreciable spines except on the shaft, the lateral margins of which 

 bear short dontiforin processes; dorsal surface with a pair of manmiil- 

 late processes on the collar, and another pair on the supracoxal region. 

 Tegmina and wings not developed. Abdomen very strongly depressed, 

 the fourth and fifth segments developing subquadrate foliaceous pro- 

 cesses from their lateral margins, those of the fourth segment being 

 about three times the size of the appendages on the fifth segment. 

 Supra-anal plate produced, rounded, the apex broadly and triangularl}^ 

 emarginate. Cerci strongly depressed, apex expanded and obscurely 

 bilobate. Subgenital plate transverse, moderately produced, apex 

 deepl}" and very narrowly cleft; styles very minute, stout. Anterior 

 coxaj with both of the lower margins supplied with five denticles; 

 femora equal to the pronotum in length, the superior face bearing a 

 distinct carinate ridge for the greater part of its length; external face 

 heavily graiuilate; external margin with seven short and stout spines, 

 one of which is apical; internal margin bearing seventeen subequal 

 spines, one of which is apical; discoidal spines three in number, distal 

 one exceeding the others in size; tibiae about equal to two-thirds the 

 length of the femora, each lower margin supplied with a comb-like 

 series of spines, which are of greatest length distally; the external 

 margin bears about twenty-six in its series, the internal margin seven- 

 teen; metatarsi equal to the remaining tarsal joints in length. Pos- 

 terior and median limbs short and stout; the femora depressed; the 



