8 EKOTYLLTLE. 



Regne Anim. Ins. p. 314) is congeneric. In his very short diagnosis of the characters 

 the only ones of importance are that the thorax is not margined at the base, and that 

 the head bears " two stridulating plates." The other characters mentioned are common 

 to Trapezidera and Dasydactylus, and the last-named one does not seem satisfactory, for 

 certain Dasydactyli have minute files on the base of the head. Nevertheless the genus 

 is quite a natural one, and possesses good characters, both in the sulci near the eyes and 

 in sexual distinctions ; I give a fresh definition : — 



Head with the epistoma transverse or nearly square, quite distinct from and produced 

 well in front of the antennal fossae ; labrum membranous, only corneous at its front 

 edge ; orbital striolae deep and sulciform, double behind the middle of the eye, the 

 orbital canthus raised behind. Antennae short, their club elongate ; the seventh joint 

 smaller than either of the four apical ones. Thorax usually trapezoidal and very 

 shining ; slightly more convex, and with the front angles more reflexed, in the males ; 

 the base without marginal line. Tarsi (especially the front pair) spongy beneath ; with 

 short ciliae, and fine hairs above. Front femora of the male subclavate, thickened 

 outwardly, and on the inner side finely sulcate, or with very fine tubercles ; they are 

 also a little curved. Apical segment of the male with an arcuate excision, which is not 

 symmetrical, being most cut out on the right side, the apex between being acuminate 

 and finely carinate ; the excision on each side is ciliate. 



This latter character is most important, and in combination with the sulci will 

 determine the male sex of any of the species known to me. 



1. Teretilanguria panamae. (Tab. I. figg. 5, 5 a, 6 .) 



Teretilanguriapanam.ee, Crotch, Cist. Ent. i. p. 394 \ 



" T. Jcirschii valde affinis, sed thorace antice paullo latiore, angulis anticis incrassatis; capite antice fortius 

 punctate lineisque frontalibus minus parallelis distincta videtur." 



Hab. Panama 1 , Volcan de Chiriqui, Bugaba {Champion). 



I do not find any example of this species in Crotch's collection ; but I have no doubt 

 that about a dozen specimens captured by Mr. Champion are referable to it, differing as 

 they do from T. Mrschii by the strong punctuation of the head. Crotch, however, was 

 deceived about the difference in the form of the thorax. Though the sexes differ as 

 already mentioned, I can see absolutely no difference in this respect or in the structure 

 of the head between these and typical T. Mrschii, to which, therefore, it is very closely 

 allied indeed. 



2. Teretilanguria metallica. 



jEnea ; prothorace distincte acuminate punctato, depressiusculo ; pedibus nonnunquam runs. Long. 20-24 



millim. J $ . 

 Mas femoribus anticis parum incrassatis et curvatis, intus minute tuberculosis; segmento ventrali apicali 



utrinque exciso, latere dextro profundius exciso, apice acuminato et carinato. 



Hab. Nicakagua, Chontales (Belt); Cqsta Rica (Van Patten). 



