176 PROCEEDINGS OP THE NATIONAL. MUSEUM vol. 65 



sternum truncate in front and grooved at the middle. Prosternum 

 with the anterior margin feebly emarginate in front; prosternal 

 process flat, and acuminate at apex. Posterior coxae dilated in- 

 ternally; anterior margin feebly sinuate; posterior margin oblique. 

 Legs feebly robust ; femora and tibiae normal ; tarsi moderately long. 

 Abdomen short and convex; the last segment in the male with a 

 transverse carina, and sinuate at the middle, the female with a large 

 transverse depression. Body flat, short, and rectangular. 



This genus was erected by Thomson (1857) for chrysomelina from 

 Haiti, which is a synonym of quadrata Buquet. Steinheil (1872) 

 erected the genus Pachypyga for a new species undata from the Argen- 

 tine Republic, which is supposed to be congeneric with quadrata 

 Buquet. So far, only six species have been described in this genus, 

 four from South America, one from Guatemala, and the other one 

 from Haiti. 



TETRAGONOSCHEMA QUADRATA (Buquet) 



Anthaxia quadrata Buquei, Rev. Zool., 1841, pp. 194-195. 

 Tetragonoscliema chrysomelina Thomson, Archiv. Entom., vol. 1, 1857, 

 p. 116, pi. 10, fig. 2. 



The following is a translation of Buquet's original description : 



Cyaneous, shining; elytra uneven and marked with three excava- 

 tions ; antennae, legs and abdomen greenish-bronzy. Length, 4 mm. ; 

 width, 2.75 mm. 



Brilliant dark blue above. Head wide, finely reticulate and nearly 

 covered with a very feeble network, and with a distinctly marked 

 broad longitudinal groove in the middle. Eyes rather large and of 

 a brownish color. Antennae brilliant green. Thorax very narrow 

 at base, convex, nearly two times as wide as the head at the extrem- 

 ity, with a transverse groove, and bordered at the lower part by 

 a brilliant, smooth, narrow line, which very distinctly detaches it 

 from the elytra. Scutellum triangular, and longer than wide. 

 Elytra nearly as wide as long, flat, parallel, uneven, and cut off 

 squarely at base, rounded at the apex, and each elytron with three 

 deep transverse impressions; the first near the scutellum, and inter- 

 rupted in the middle by a longitudinal costa; the second a little 

 behind the first ; and the third situated near the apex ; these are cov- 

 ered with a very fine reticulation, and bordered besides in their entire 

 length. Body beneath finely punctate, and also the legs, which are 

 a brilliant green. It has been given to me by Mr. Petit de la Saus- 

 saye, as having been found in Santo Domingo. 



The species was first described by Buquet (1841) from Santo 

 Domingo. Thomson (1857) described the same species under the 

 name chrysomeWna from Haiti, for which he erected the new genus 

 Tetragonoschema. The species seems to be rare in collections, as no 

 specimens have been available for examination, and Dr. C. J. Gahan 

 states that the species is not represented in the British Museum 

 collection. 



