158 Annals Entomological Society of America [Vol. VI, 



Megastigmus physocarpi n. sp. 



Female. — Length, l.S mm.; abdomen, .8 mm.; ovipositor, .8 mm. 



Head and prothorax yellow, rest of thorax and abdomen brownish 

 yellow, the latter much darker. Head and prothorax delicately trans- 

 versely mgulose; mesothorax with a more pronounced sculpture; 

 propodeum closely but distinctly reticulate, a distinct median carina 

 present. A brownish line connects the ocelli. 



Scape yellow; pedicel dusky above, yellow beneath, rest of antennas 

 dusky. Legs including coxee light yellow. Wings hyaline. The stig- 

 mal club is narrow "and elongate; not surrounded by a clouded area. 



Most of the females agree with this description but there are three 

 specimens in which the ovipositor is not over half the length of the 

 abdomen. In these specimens the prothorax has a median black stripe 

 narrower behind and the rest of the thoracic dorsum is black except 

 the scapulce and the posterior part of the propodeum. 



Male. — Length, 1.6-1.9 mm.; abdomen, .7 mm. 



Fig. 2. Megastigmus physocarpi. 



Similar to the female in color except the abdomen is more or less 

 dark brown above, the antennse are paler and the brown line con- 

 necting the ocelli is lacking. Stigmal club surrounded by a dark, 

 nearly circular clouded area. 



There are three males marked with black like the females with the 

 short ovipositor. The abdomen is nearly black above except at tip. 



Described from 15 females and 6 males from Allentown, 

 Mo., October, 1893, and 1 male from Kirkwood, Mo., 1 July, 

 1895. All reared from Physocarpus opulijolius, probably from 

 the seeds. 



Megastigmus nigrovariegatus Ashmead. 



Megastigmus nigrovariegatus Ashmead. Bull. Colorado Biol. Association, I, p. 26. 



1890. 

 Megastigmus nigrovariegatus Cockerell. Bull. 15, Ariz. Exp. Sta., p. 69, 1895. 

 Megastigmus aculeatus Crosby, (in part.) Cornell Agr. Exp. Sta., Bull. 265, pp. 



377-379. Figs. 82, 83, 1909. 



Female. — Length, 3.4 mm.; abdomen, 1.6 mm.; ovipositor, 2.5 mm. 



Vertex, antennal grooves and a spot above clypeus dark brown; 

 face and anterior and dorsal eye margin dull brownish yellow; cheeks, 

 posterior eye margin and occiput shining brownish. 



Prothorax bright yellow posteriorly and on the sides, brownish in 

 front on the lateral angles and just above the front coxae. Mesonotum 



