378 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BulL 



scapulae yellow ; legs brownish yellow ; tips of the tarsi brown ; 

 wing veins pale, areolet almost obsolete, the prolongation of the 

 second transverse vein only being distinct; first segment of the 

 abdomen longitudinally striate, the second segment concealing all 

 of the following, the tip of the sheath of the ovipositor sometimes, 

 although not always, protruding behind the hind edge of the 

 second segment; the abdomen polished and black, sometimes 

 brownish along the hind edge. 



S. dimorphus Osten Sacken. 



Female: length 3-3.3 mm.; head black, except the face, 

 which is brownish red mixed with black below the antennae ; man- 

 dibles, except their tips, which are black, and more or less space 

 near their bases on the cheeks, yellowish ; the brownish coloring 

 of the face extending along the eyes above the insertion of the 

 antennae as a narrow stripe; vertex black, rather shining, with 

 sparse, umbilicate punctures; antennae brownish yellow, 13- 

 jointed, about three-fourths as long as the body, the fourth joint 

 a little longer than half the third, the fourth, fifth and sixth joints 

 nearly equal in length, the succeeding joints somewhat shorter, 

 except the last joint, which is about equal to the two next preced- 

 ing combined ; thorax black, moderately shining, with transverse 

 rugosities; pubescence short and very sparse, parapsidal grooves 

 distinct, punctate at the bottom, scutel coarsely sculptured, its 

 basal foveae indistinct, the smooth space of the pleurae almost 

 entirely aciculate, scapulae brownish yellow ; legs brownish yellow, 

 hind tibiae and a part of the first joint of the hind tarsi infuscated, 

 tips of all the tarsi brownish ; veins of the wings brownish ; first 

 segment of the abdomen longitudinally striate, the second seg- 

 ment concealing all of the following; ventral valve ending in a 

 short pubescent point and usually projecting beyond the edge of 

 the second segment ; abdomen polished and black, its ventral valve 

 yellowish brown. Male: length 2.5 mm.; antennae 15-jointed, 

 the third joint excised below, fourth joint half as long as the 

 third ; head yellow, except a black spot on the vertex, which in- 

 cludes the ocelli ; a part of the pronotum and of the pleurae also 

 yellow, the yellow seemingly variable in extent in different indi- 

 viduals ; abdomen truncate at the tip, bell-shaped when seen from 

 the side; the sculpture of the head and thorax and the coloring 

 of the legs the same as in the female. 



