HANCOCK 49 



GENUS CHIRIOUIA, MORSE. 



Related to Ptcrotcttix, especially in the form of the elytra, 

 but differing from that genus in having the posterior ocelli 

 below the level of the eyes and also in the structure of the 

 vertex. 



Morse, Biol. Cent. Am., II., 7 (1900). 



CHIRIOUIA SERRATA, MORSE. 



Plate I., Fig. 6. 



Body somewhat depressed. Face moderately retreating; 

 eyes large, globose, very prominent, elevated on the sides of 

 the vertex; antennas inserted below the level of the eyes, 

 equidistant from the eyes and each other; posterior ocelli 

 barely below the level of the eyes. Vertex horizontal, elevated 

 at the sides above the eyes to form transverse carinje, running 

 obliquely downward and inward to the mid-carina; the latter 

 conspicuous from above, but hidden in side view by the promi- 

 nent eyes, dividing opposite their lower part into high, rather 

 widely divergent antrorse rami; from above the vertex is nearly 

 twice the width of one of the eyes, distinctly excavate, with 

 a prominent median tooth (the mid-carina) reaching the level 

 of the front margin of the eyes. Face in profile strongly 

 crenate, the middle arc formed by the prominent rami of the 

 frontal costa, the upper arc by the e^'es terminated by a min- 

 ute portion of the transverse carina of the vertex. Pronotum 

 with truncate anterior margin and cuneate apex, of moderate 

 width at the shoulders, granulate, rather flat above, with the 

 exception of several prominent transverse rugje, which form 

 on the mid-carina a series of low teeth between the shoulders 

 and apex, and in front of the humeral angles a high cristiform 

 eminence convexly arcuate in front, concave behind, its height 

 from the shoulders equal to two-thirds the depth of the lateral 

 lobes; lateral lobes laminate, strongly produced, squarely 

 truncate at the apex. Elytra minute, the exposed portion 

 linear, five times as long as broad; wings fully developed, 

 reaching the apex of the pronotum, which passes the abdomen 



