1910] Brues, North American Parasitic Eymenoptera IX. 77 



Pezomachus maculicollis Brues. 

 Trans. Amer. Ent. Soc, Vol. 29, p. 121 (1903). 

 In this species the antennae are 20-- jointed, the head quite 

 distinctly less than twice as broad as long, and the malar line less 

 than halt" as wide as the face. The metathorax is very strongly 

 gibbous, its transverse carina slightly arcuatelv curved and not 

 strongly sinuous as in most species. The abdominal petiole is 

 scarcely twice as broad at the tip as at the base. 



Pezomachus minutus Walsh. 

 Ins. inj. vegetation in Illinois, p. 36. (1861). 

 This little species as I have identified it has the transverse 

 carina of the metanotum complete and no indication of a scutel- 

 lum. The abdominal hairs are very sparsely placed. 



Pezomachus arsgularis Brues. • 



Trans. Amer. Ent. Soc., Vol. 29, p. 122. (1903). 

 The abdominal hairs are densely placed, and the mesonotum 

 has a very distinct, sharply projecting tubercle on each side be- 

 hind. There is no indication of a scutellum. 



Pezomachus birkmani Brues. 

 Trans. Amer. Ent. Soc, Vol. 29, p. 121. (1903). 

 This species has the hairs covering the surface of the abdomen 

 verv sparcelv placed. The mesonotum is produced into an angu- 

 lar tubercle on each side above the tegul?e and the scutellum, indi- 

 cated by a slight depressed line separating it from the mesonotum, 

 is large and weakly convex. 



Pezomachus crassulus Brues. 

 Trans. Amer. Ent. Soc. Vol. 29, p. 123. (1903). 

 The metanotum of this species is finely irregularly wrinkled, 

 the transverse carina is very indistinct medially and there is a 

 longitudinal furrow-like depression medially near the base. The 

 scutellum is not distinctly separated, although suggested by a 

 slight transverse groove. The abdominal hairs are moderately 



sparse. 



Microcryptus (Theroscopus) vernalis sp. nov. 



Length 5.5 mm. Head and thorax black; abdomen black, except 

 for transverse bands at the base of the second and third segments ; 



