OF THE ISLAND OF ST. VINCENT. - 173 



Derostenfs, West wood. 

 Tahle of Species. 



Females. 



Abdomen almost round 2. 



Abdomen conically produced or conic-ovate. 

 Bronze-green ; legs pale yellowish. 



Front wings with 4 brown spots D. quadrimaculatus, sp. n. 



Thorax gold-green, scaly-punctate, rarely 

 bronzed ; head, thorax, and abdomen 

 beneath blue-black, the abdomen 

 above more or less metallic ; legs, 

 except anterior coxae, and scape white. 



Front wings hyaline D. aoutus, sp. n. 



2. ^neous ; scape and legs white D. rotundus, sp. n. 



Males. 



Abdomen ovate ; head and abdomen purplish, 



the thorax greenish aeneous ; scape and 



legs, except anterior coxae, white D. acutus, sp. n. 



Abdomen round ; bluish or purplish, the 



thorax with an aeneous tinge above ; 



abdomen with a transverse white spot at 



base ; scape and legs, except coxae and a 



dusky streak on femora, white D. rotundus, sp. n. 



DerOSTENUS QUADEIMACDIiATUS, Sp. n. 



5 . Length. 1"1 millim. Bronze-green, the thorax feebly sha- 

 greened ; antennae except club, and legs except coxae pale 

 brownish yellow ; club brown-black ; hind coxae blue. The 

 antennae are 9-jointed ; the first funicle-joint is smaller than 

 the 2nd and 3rd, which are about equal ; the 4th is quadrate, 

 larger and thicker than the preceding and distinctly separated 

 from the club and the 3rd funicle-joint ; the club is 3-jointed, 

 conic-ovate, and nearly three times as long as the last funicle- 

 joint. "Wings hyaline, with four brown maculae : one at the 

 middle of the marginal vein, another enclosing the stigmal vein ; 

 while the other two are on the hind margin, each being directly 

 opposite those first mentioned. Abdomen conic-ovate, longer 

 than the head and thoi'ax united, and produced into a prominent 

 though short oviduct at the tip. 



Sai. St. Vincent. 



Described from a single specimen. 



