276 OKTHOPTERA. 



prominent and roundly advanced upon the occiput, hind margin obtusangulate, the median carina visible 

 throughout but faint, lateral carinas wanting, the sides of the hind lobe being provided with blunt 

 shoulders ; transverse sulci profound, continuous. The anterior edge or collar separated from the rest of 

 the lobe by a deep stricture that appears as if impressed by a tightly drawn string. Pleura of meso- and 

 metathorax strongly and closely punctate. Tegmina and wings complete, the former semi-membranous, 

 rather strongly but sparsely veined, a little longer than the abdomen, the apex rounded ; wings vitreous, 

 shiny. Hind femora only moderately robust, the carinas heavy but low, the upper one scarcely 

 tuberculate, the pagination of outer face close and strongly oblique. Hind tibia noticeably shorter than 

 the femora, robust, with short, strong, entirely black spines, nine on each margin, the outer apical one 

 present but minute. Interspace between the mesosternal lobes strongly transverse, the inner edge of the 

 lobes rounded ; metasternal space nearly as wide as long. Prosternal spine pyramidal, coarse. Yalves 

 of the ovipositor large, exserted, the apices strongly hooked. Second joint of hind tarsi scarcely two- 

 thirds as long as the first. 

 Length of body, $ , 42 ; of pronotum 7*2, of tegmina 34, of hind femora 19, of hind tibiae 15-5 millim. 



Hdb. Mexico, Valladolid in Yucatan (Gaumer). 



A single female. A second individual is before me as I write ; it comes from Brazil 

 and seems to differ sufficiently to constitute another species, and the two together a 

 separate genus from Abila (vide antea). 



PSILOTETTIX, gen. nov. 



The insects comprising this genus are rather small, short-bodied, but very robust, entirely apterous, with the 

 surface throughout rugose, punctate. The head is about as broad as high, though somewhat narrower 

 than the front edge of the pronotum, into which it is set nearly to the eyes ; occiput not ascending, rather 

 flat, provided with a median longitudinal carina and a broad depression in front and just back of the 

 upper points of the eyes ; the latter of medium size and prominence, rounded behind, nearly straight 

 in front ; the vertex moderately wide, but not quite so broad as the frontal costa between the antenna?, 

 separated from the occipital pit by a blunt transverse ridge and provided with rather strong lateral walls ; 

 the fastigium depressed, broadly and gently sulcate, twice as wide as long, truncate in front ; frontal 

 costa moderately prominent between the antennas, where it is broadest, a little narrowed both above and 

 below, continuous to the clypeus, in nowise sulcate, save a gentle depression at the ocellus ; face viewed 

 laterally broadly arcuate, the lateral carinse strongly divergent below ; antennae about 18-jointed, short, 

 rather heavy, the joints a little depressed, especially apically and thereby giving to them a semi-clavate 

 appearance. Pronotum gently tectate, evenly expanding posteriorly, the median and lateral carinas well- 

 defined, front and hind borders of disc straight, the transverse sulci very faint, two in number; posterior 

 lobe very short, less than one-half the length of the anterior one. Hind femora moderately robust at 

 base, gently tapering, the genicular portion small ; hind tibiae short and fairly heavy, 7-spined externally, 

 9-spined internally. Prosternal spine coarse, broadly transverse, the mesosternal space transverse, the 

 edges straight, metasternal space somewhat longer than wide. Valves of ovipositor rather small but 

 distinctly hooked, well obtected. Auditory apparatus quite conspicuous, nearly circular. 



1. Psilotettix obesilS, sp. n. (Tab. IV. figg. 12, 12 a, $ .) 

 General colour (after immersion in alcohol) very pale testaceous, with a small dash of brown or piceous on 

 sides of head back of eyes and on front edge of sides of pronotum, and an oblique dash on the outer side 

 and two patches on the inner side of the hind femora, the latter also having the lower edge more or less 

 infuscated between the lower carina and inferior margin of the outer face, as well as apically, in the 

 sulcus. The genicular lunules are piceous. Besides these, there are a number of large blackish 

 punctures scattered over the insect generally, giving it a mottled appearance. 

 Length of body, $ , 16 ; of pronotum 4, of hind femora 10, width of metathorax 6 millim. 



