CHRYSOPSACRIS. 283 



Specimens of an insect in the present writer's collection have been determined as 

 Marschall's Gryllus bucephalus. While there can be but little doubt as to their 

 identity, they are certainly not even congeneric with the insect which Dr. Giglio-Tos 

 had before him when he diagnosed his genus Bucephalacris, on what he supposed was 

 Marschall's species. This insect of Giglio-Tos' has characters which place it near 

 Anniceris and Proctolabus. Ours, on the other hand, falls near Jodacris and 

 Omalotettix. Since a second species of the genus which occurs in Costa Rica is also 

 found in company with the present insect in British Guiana and Venezuela, it is more 

 than likely that the range of C. bucephala will be found to extend at least to Panama. 



[2. Chrysopsacris atrocephala, sp. n. 



Of about the same size as that of the male of G. bucephala (Gryllus Bucephalus, Marsch.), but differing from 

 that species in the absence of all markings on the tegmina and legs, and especially on the hind femora. 



Eyes large and prominent, suborbicular, a little longer than that portion of the cheeks below them ; vertex 

 between the eyes very narrow, about as wide as the diameter of the second antennal joint, linearly 

 sulcate, the portion in advance horizontal, short, shallowly sulcate ; face rugose and coarsely punctate, 

 the frontal costa prominent between the base of the antennae and shallowly sulcate and coarsely punctate, 

 nearly as broad again as the width of the vertex, contracting below the ocellus and fading towards the 

 clypeus ; lateral facial carinas but little divergent below, well-defined and coarse. Antennas linear, 

 coarse, a trifle longer than the hind femora, the basal joint large and fully twice the width of the 

 vertex. Occiput short, shallowly bifoveolate laterally. Pronotum rather short, subcylindrical, without 

 lateral carinas, the surface rugoso-punctate, the transverse sulci rather profound, anterior lobe considerably 

 longer than the hind one, the anterior edge a little rounded, the posterior edge obtusely angulate. 

 Tegmina a little shorter than the abdomen, narrowed towards the apex, which is rounded, sparsely veined. 

 Wings broad, blunt at the apex. Hind femora moderately robust, extending about one-third of their 

 length beyond the apex of the abdomen. Hind tibiae 7-spined in outer row. Third joint of the hind 

 tarsi long and provided with long and strong claws. Abdomen short, fairly slender, the last ventral 

 segment short and prow-shaped ; the supra-anal plate simple, roundly triangulate, broadly and shallowly 

 sulcate. Cerci rather stout, sub-pyramidal, a little longer than the basal width, with a stout internal 

 basal tooth. Prosternal spine rather short, acuminate. Legs and abdomen hirsute. 



The insect is coloured as follows : — Antennae shining black ; head dull brown-black, tinged with olive-green 

 below the eyes, the latter ferrugineo-testaceous with a brassy tinge ; pronotum brownish-testaceous, the 

 pleura, abdomen, and pectus with a more ferruginous tinge; tegmina immaculate, brown, with testaceous 

 nervures ; wings deep blue, save the costal margin and apex, which are fuliginous. Hind femora vinous, 

 the tibiae infuscated apically ; anterior and middle femora and tibiae greenish, the tarsi tinged with dark 

 ferruginous. 



Length of body, d , 16 ; of antennae 12*5, of pronotum 3*5, of tegmina 10*5, of hind femora 11 millim. 



Ilab. British Guiana, Demerara (coll. L. Bruner), Bartica (coll. P. A. N. S.). 



Two males from each locality. The type was collected by R. J. Crew during the 

 late winter and early spring of 1901.] 



3. Chrysopsacris costaricensis, Eehn. 



Jodacris (?) costaricensis, Rehn, Proc. Acad. Nat. Sci. Philad. 1905, pp. 430-433, figs. 28, 29 l . 



Hab. Costa Rica 1 , Pozo Azul [M. A. CarriJcer). — British Guiana, Demerara {coll, 

 L. Bruner). 



2 Oo 2 



