CALOTETTIX. — AGBCECOTETTIX. 311 



3. Calotettix brevispinis, Rehn. 



Sinaloa brevispinis, Rehn, Proc. Acad. Nat. Sci. Philad. 1904, pp. 535, 536 \ 

 Hab. Mexico, Victoria in Tamaulipas 1 . 



This insect is represented in the present writer's collection by one of the female 

 co-types. It comes very near the following species. 



4. Calotettix obscurus, sp. n. 



This insect, which is the smallest of the known species belonging to the genus, is characterized by its general 

 dark brownish-olive colour and rather slender form, and in having the hind tibiae almost wholly red. 



Head short, very little broader than the front edge of the pronotum, into which it fits almost to the hind 

 edge of the large and somewhat prominent eyes. The latter elliptical, of about the same form in front 

 and behind, nearly twice as long as the cheeks below them, and separated at the vertex above by a space 

 little or no wider than the diameter of the second antennal joint. Vertex narrowly but deeply sulcate, 

 the fastigium or vertex anteriad of the eyes roundly depressed and ovately sulcate, the margins 

 prominent ; frontal costa prominent, gently sulcate and grossly punctate, its sides contracted at a point 

 just below the ocellus, but immediately resuming the general width and continuous to the clypeus. 

 Antennas moderately stout (broken in the specimen at hand), the basal joint nearly twice as broad as 

 the vertex between the eyes. Pronotum subcylindrical, only a little expanding behind, the anterior 

 lobe coarsely and irregularly punctate above, nearly twice the length of the posterior one, whieh is 

 much more closely and finely punctate, the median carina strong throughout, interrupted by all three 

 sulci ; the posterior margin of the disc squarely truncate. Tegmina lateral, broadly spatulate, 

 unicolorous, numerously and coarsely reticulated, their apices reaching the hind margin of the first 

 abdominal segment. Hind femora robust, extending beyond the tip of the abdomen by the length of 

 their knees. Abdomen rather coarsely rugose and punctate above, provided with a conspicuous but 

 blunt dorsal carina, scarcely clavate apically ; last ventral segment triangular, short, gently upturned, 

 the apex entire ; supra-anal plate plain, elongate-triangular, the middle of the basal half deeply and 

 narrowly sulcate ; the marginal apophyses of the preceding segment finger-like, minute, and attingent, 

 resting in the sulcature of the supra-anal plate at its base. Cerci lamellate, as long as the plate, of 

 nearly equal width, slightly sulcate externally, and with the lower apical edge obliquely docked. 

 Prosternal spine coarse and prominent, about one and one-half times as long as broad at the base, 

 directed gently to the rear. Hind tibiae provided with ten spines in the outer row. 



General colour very dark brownish-olive, varied with testaceous and piceous on the head, pronotum, and 

 abdomen ; the limbs, especially the hind pair, decidedly olivaceous. Sides of pronotum with indications 

 of a rather broad piceous band, followed below by an oblique testaceous one, the former interrupted in 

 the middle by a patch of olive-brown. The edges of the disc of the pronotum and the hind margins of 

 the eyes on the occiput show traces of the testaceous bands which in both 0. bicoloripes and G . jlavopictus 

 are yellow and so plainly visible. The < -shaped marks of the dorsum of the abdominal segments and 

 the transverse bands on tne upper edge of the hind femora are also faintly testaceous in the present 

 species, whereas in the others, when present, they are conspicuous and yellow. Hind tibiae and tarsi red, 

 the former brownish basally. 



Length of body, S , 15*5 ; of pronotum 3-6, of tegmina 2-85, of hind femora 10 millim. 



Hab. Mexico, Tampico (coll. L. Bruner). 

 A single male, captured in December. 



AGRGECOTETTIX, gen. nov. 



A genus composed of medium-sized, brachypterous, dark-coloured locusts in which the body is rather coarse 

 and loosely jointed. Head large and broader than the front edge of the pronotum. Pronotum rather 

 longer than usual, prominently bordered all round, the front lobe tumid at the sides, the hind lobe 



