254 Mr. W. H. Ashmoad's 



Subfamily III. MONODONTOMERINJE. 



Genus Physothorax, Mayr. 



The rearing of some of the parasitic insects from wild 

 figs in Florida and elsewhere shows that Dr. Mayr has 

 confused the females of this genus with Dimorus, Walker. 

 The species belonging to the true Dimorus, Walker, are 

 parasitic in the nests of bees, and are quite distinct generic- 

 ally from similar insects associated with Fig-insects. Two 

 distinct species have been noticed in the St. Vincent 

 material, as follows : 



140. Physothorax variahilis, Mayr. 



1885. Diomorus variabilis, Mayr, Verb. Zool. bot. Ges. 



Wien, XXXV, p. 228, $ . 

 1898. Dalla Torre, Cat. Hym., v, p. 291. 



St. Vincent. One $ specimen. 



141. Physothorax imllidALS, n. sp. 



$, Length l'5-2 mm.; ovipositor a little longer tlian the body, 

 black. Brownish-yellow, with a slight violet reflection and with a 

 sparse, feeble, thimble-like punctuation ; flagellum and apical joints 

 of tarsi dark Ijrown. Wings hj'aline, iridescent, the marginal ner- 

 vure brownish but very long, being only a little shorter than 

 the subcostal vein, the stigmal vein minute. Hind femora with 

 two teeth towards apex beneath, the surface below feebly serrate. 

 Dorsal flap of second abdominal segment emarginate at the apical 

 middle. 



(^. Length 1-25 mm. Agrees with the female, except that it is 

 smaller, paler and less distinctly punctate ; the club of antennre, the 

 eyes, the ocelli and teeth of mandibles brown, the club being thicker 

 than the funicle, while the dorsal flap of the second abdominal 

 segment is straight, not emarginate. 



A dimorphic, wingless male also occurs, agreeing with the winged 

 males only in colour, and in liaving the usual two teeth on tlie hind 

 femora, but in sculpture and in the structure of antennte, thorax 

 and head it is quite different : It measures only "65 mm. in length 

 and is smooth and polished ; the head is vertically oblong, the eyes 

 being deformed, narrow and situated in a slight depression laterally ; 

 antennse very short, not as long as the head, 6-jointed, the scape 

 short and slender, pedicel small, one minute ring-joint and a short, 

 stout, clavate, 3- jointed flagellum. 



