134 ME. W. H. ASHMEAD ON THE PARASITIC HTMEITOPTERA 



2. Black ; second abdominal segment with a yellow 



band, longer than the first 0. unifasciatus. 



Honey-yellow or pale ferruginous, the tip of the 

 abdomen sometimes very dusky. 

 Second abdominal segment not longer than the 



first ; the recurrent nervure interstitial .... 0. interstitialis. 

 Second abdominal segment shorter than the first; 



the recurrent nervure rejected O. rejectus. 



3. Pale ferruginous or honey-yellow, head and apex of 



abdomen black or brown. 

 Antennae not ringed with white ; recurrent nervure 



not interstitial c 0. atriceps. 



Antennae ringed with white ; recurrent nervure 



interstitial 0. annulicornis. 



Opitjs SALTiisri, sp. n. 



c? $. Length 1| to 2 millim.; ovipositor mucli longer than 

 the abdomen. Black, sBining, impunctured, rarely with the 

 disk of thorax, metathorax, and a spot on second abdominal seg- 

 ment brown; legs and two basal joints of antennse honey-yellow 

 or reddish yellow, the rest of the antennse varies from brown to 

 black. In the female the antennse are 23-jointed, in the male 

 21- to 26-jointed. Thorax smooth, without furrows. Scutellum 

 foveated at base. Mesopleura with a crenate furrow. Meta- 

 thorax rugose. "Wings hyaline, iridescent, the venation dark 

 brown ; the first branch of the radius very short, the recurrent 

 nervure not interstitial, joining an angle in the second submar- 

 ginal cell. Abdomen oval, in the female the first and second 

 segments about equal, the third the largest ; in the male the 

 second segment is the longest ; the third segment is roughened, 

 the following smooth, polished. 



Hab. St. Vincent. 



Described from 30 specimens. 



Opius melanocephaiiUs, sp. n. 



S 2 • Length lto2 millim. ; ovipositor less than one third the 

 length of the abdomen. Honey -yellow, smooth, impunctured; 

 the head always black with the face sometimes pale, and some- 

 times in the male the abdomen, except the base, is sometimes 

 brown or black. Antennse in female 24-jointed, in male 22- or 

 27-jointed, variable from a honey -yellow to brown. Thorax 

 smooth, without furrows ; the scutellum foveated at base ; the 

 mesopleura with a crenate furrow, the metathorax areolated or 



