102 bulletin: museum of comparative zoology. 



Mtcrogasterinae. 



This group has been found fossil so far only at Florissant. A species 

 of Microgaster was described by the present writer (:06), and I can now 

 add Microplitis, and another, Oligoneuroides, which appears to be new. 



Microgaster primordialis Brues. 



Bull. Amer. Mus. Nat. Hist., 1906, 22, p. 496. 



This species was described from a single specimen from Florissant 

 collected by Professor Cockerell, but there are in the collection of the 

 Museum of Comparative Zoology Nos. 2354-2359, Florissant, Col., no 

 less than five specimens which can be positively referred here (S. H. 

 Scudder Coll. Nos. 3885, 5107, 5249, 6232, and 11,322-13,806. In 

 addition there is another from Professor Cockerell and also five, Nos. 

 2360-2364 M. C. Z., Florissant, Col. (S. H. Scudder Coll. Nos. 2967, 

 3026, 5341, 5758, 10,947) which are doubtfully this species. 



From the present series, the following characters can be added to 

 those given in the original description: 



Antennae 18-jointed, tapering, the joints about one and one-half times as 

 long as thick apically, twice so toward the base. Abdomen sometimes quite 

 dark in color, especially toward the base above; submedian cell longer than 

 the median by one-third the length of the basal nervure. Legs brownish or 

 reddish. 



Microplitis vesperus, sp. nov. (Fig. 85.) 



Sex? Length 3.25 mm. Black, the abdomen more or less piceous; legs 



dark, wings hyaline. Antennae rather short and tapering evenly from the 



-^ base; apparently with about 18 joints, 



J&gg^™^ the basal flagellar joints two or more 



' % ^Sl % 'i^L ^ times as long as thick, the apical ones 



s ?.'0ft"' about quadrate. Head and thorax 



smooth and shining, the metathorax 



%. 



jr^ " !;=5 > \vith indications of areolation. Abdo- 



l ^4^ men short, scarcely longer than the 



"\V thorax, shining. Legs not well pre- 

 served, but apparently rather stout. 

 Wings broad, hyaline; the stigma 

 broad, triangular, light colored as are 

 also the veins; submedian cell much 

 is vesperus, sp. now longer than the median, first discoidal 



cell above indistinctly petiolate; second 

 cubital cell large, triangular, the cubi- 

 tus prolonged a short distance beyond its apex; radius beyond the first 

 short section wanting. 



