1906.] NATURAL SCIENCES OF PHILADELPHIA. 27S 



the two species would appear, from the evidence in hand, to be correct^ 

 The author's B. hiolleyi * differs from posticus in the paler coloration, 

 the more numerous and finer veins of the anal area of the tegmen and 

 the separate and distinctly outlined maculations of the pronotum. 



MANTID.^. 

 ACONTISTA Saussure. 

 Acontista perspicua (Fabricius). 



1787. [Mantis] perspicua Fabricius, Mant. Insect., I, p. 230. [Cayenne.] 



One male, one female. 



This species is known only from the Guianas. 

 Angela guianensis n. sp. 



Types: c? and ? ; Demarara, British Guiana. 1901. (R.J. Crew.) 



Closely allied to A. quinquemaculata (St oil) from Cayenne, but dif- 

 fering in the coloration of the wings in both sexes, particularly in the 

 absence of yellow in the male, and also in the short tegmina and wings 

 of the female. From brachyptera (Stoll) it can be separated by the 

 unspined margins of the caudal section of the pronotum and the tuber- 

 culate abdomen, as well as the color of the wings of the male. The 

 coloration of the wings of fulgida-yand trifasciata readily separates the 

 new form from these species. 



Size rather large; form as usual in the genus, male bacilliform with 

 elongate tegmina and wings, female^elongate with quite short tegmina 

 and wings; surface smooth but not polished. 



(^ . Head strongly transverse, occipital outline straight except for a 

 pair of slight lateral depressions; eyes prominent, ovoid in outline 

 when viewed laterad, rounded and projecting slightly cephalad of the 

 general level of the face but nearly plane caudad; ocelli large, elliptical, 

 placed in a low, broad triangle; facial scutellum arcuate transverse, 

 the arcuation dorsad; antennae as long as the head and pronotum 

 together, moderately serrulate. Pronotum with the coxal dilation 

 slight, subequal cephalad and caudad of the same; lateral margins of 

 the collar distinctly dentate, of the shaft slightly dentate cephalad, 

 smooth caudad; median carina distinct throughout the length of the 

 pronotum but quite delicate on the collar, the shaft compressed trigonal 

 in section. Tegmina slightly longer than the head and pronotum, 

 when in repose reaching nearly to the tip of the third abdominal seg- 

 ment; margins subparallel, apex rounded acute-angulate, the sutural 

 margin being considerably trimmed toward the apex; costal field 

 moderately expanded proximad and very gradually narrowing distad ; 



* Ibid., p. 792. 



