290 OETHOPTEEA. 



Synopsis of the Species of Ommatolampis. 



A 1 . Tegmina present but short, the disc marked with a large black eye- 

 like spot; antennae dark, unicolorous, except at tip, where they 

 are pale [1. perspicillata, Linn.] 



A 2 . Body apterous ; the antennae alternately pale and dark coloured . 2. annulicornis, sp. n. 



[l. Ommatolampis perspicillata, Linn. 



Gryllus (Locusta) perspicittatus, Linn. Syst. Nat. ed. 12, ii. p. 703 (1767) \ 

 Gryllus perspicillatus, Fabr. Ent. Syst. ii. p. 62 (1793) 2 . 



Ommatolampis perspicillata, Burm. Handb. Ent. ii. p. 637 (1838) 3 ; Sauss. Rev. et Mag. Zool. 

 1859, pp. 393, 394 \ 



Hab. Beitish Guiana (coll. L. Bruner) ; Beazil 1_4 . 



This insect, which is very well represented by Stoll in his " Repr. Spectres, etc.," on 

 plate 8 b. fig. 28, is a typical species of the genus. It may occur in the extreme 

 southern portion of the Isthmus of Panama.] 



2. Ommatolampis annulicornis, sp. n. 



A medium-sized, dark brown, entirely apterous, somewhat fusiform locust, with alternately dark- and light- 

 ringed joints to the antennae, and the basal half of the abdomen largely pitchy-black at the sides. Front, 

 lower portion of cheeks, pronotum, meso- and metathorax, and basal abdominal segments rugosely 

 punctate. 



Head no broader than, or scarcely as wide as, the front edge of the pronotum, viewed laterally rather oblique ; 

 vertex a little narrower than the diameter of the first antennal joint, somewhat depressed anteriorly and 

 narrowly sulcate, the groove continuous with that of the elongate-triangular fastigium where the 

 sulcation widens and deepens, the fastigium nearly horizontal ; frontal costa prominent between the 

 antennas, about as broad as the vertex between the eyes, sulcate throughout, becoming very much 

 weaker below the ocellus. Antennae filiform, of moderate length, brownish-testaceous at the base, 

 gradually darkening beyond, with several pale annuli, the basal annuli testaceous, the apical ones 

 whitish. Pronotum gradually expanding posteriorly, all three carinae very faint, the hind lobe short, not 

 quite half as long as the anterior lobe, only the last transverse sulcus profoundly impressed ; anterior 

 edge sinuose, posterior edge truncate, gently and roundly emarginate at the centre. Auditory apparatus 

 small and nearly circular, situated low down and close to the posterior edge of the tergite. Hind femora 

 rather slender and reaching a little beyond the tip of the abdomen, the dorsal carina only slightly 

 dentate; hind tibiae 6-spined externally, 8-spined internally, the tarsi normal. Mesosternal lobes 

 separated by a subquadrate space that is wider than long and a little greater than the width of the lobes 

 themselves. Prosternal spine acuminate, straight, of moderate length. Terminal joints of the palpi 

 pale, those of the maxillary pair strongly depressed, elliptical. Valves of ovipositor short, strongly 

 hooked. 



Eyes brassy, occiput, dorsum of abdomen, and disc of pronotum a little paler than elsewhere, the black patch 

 on the sides of the abdomen crenulate above. Hind tibiae deep brown. 



Length of body, $ 29 ; of pronotum 5, of hind femora 17 millim. 



Hab. Costa Rica, Pozo Azul (M. A. Carrifcer, coll. L. Bruner). 



A single female. Other species of the genus will undoubtedly be found to occur 

 north of the Isthmus of Panama. 



