1865.] 377 



ventral valve yellowish-brown : feet brownish-yellow; hind tibire and a part 

 of the first joint of the hind tarsi infuscated: tips of all the tarsi brownish; 

 veins of the wings brownish ; areolet rather small, its structure like that of the 

 preceding species. 



Male. 0.10 long; antennse 15-jointed, third joint excised below, fourth half 

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

 cludes the ocelli; a part of the collare and of the pleurae also yellow, which 

 color seems to be variable in extent in different specimens; abdomen truncate 

 at the tip, bell-shaped, when seen from the side ; tbe sculpture of the head and 

 thorax and the coloring of the feet are the same as in the female. 



Numerous 9 an d t wo $ specimens, found in the box containing my 

 collection of galls ; I have not been able to ascertain what gall pro- 

 duced them. 



This species is distinguished from S. campanula by its more elon- 

 gated shape, the sculpture of the vertex, the coloring of the hind tibiae, 

 etc. Viewed from above, the abdomen is more elongated-oval than that 

 of S. campanula ; the sculpture of the thorax appears rough, as the 

 wrinkles seems to be due to sharp, projecting ridges, whereas the tho- 

 rax of *S'. campanula, although more densely wrinkled, has a handsomely 

 smooth appearance ; the pubescence on the thorax of the latter species 

 is more dense, etc. Besides, the antennae of the $ of S. dimorphus 

 are 13 and not 14-jointed. The punctures on the vertex of this species 

 can be perceived only under a rather strong lens. 



0. Synergus albipes Walsh, % 9 • 

 Syn. Synophrus albipes Walsh, Proc. Ent. Soc. II, p. 496, 17. 

 Antennae ( $ ) 14-jointed. according to Mr. Walsh, the last joint one- 

 third longer than the preceding one (the tip of the antennae of my only 

 9 is broken.) The entire body is black, except the yellow palpi, the 

 yellowish-brown mandibles and the brownish-yellow scapulae. The ver- 

 tex is moderately shining, without any apparent punctures. The thorax 

 is moderately shining, very finely and evenly rugoso-punctate; its pu- 

 bescence short, moderately dense and very even ; the parapsidal grooves 

 but moderately distinct ; the polished space on the pleurae microscopi- 

 cally aciculate. The first abdominal segment is longitudinally striate; 

 " the sheaths of the ovipositor do not project beyond the line of the 

 back, or scarcely, and in a single 9 only" (Walsh) ; the ventral valve 

 is considerably projecting beyond the edge of the second segment ; its 

 tip at an angle of more than 45° ; it is extended in a very short apicule; 

 the shape of the second segment, as seen from the side, is nearly like 

 that of S. dimorphus. Feet pale whitish-yellow, tarsal tips brown ; 

 " in a single % the hind femora and tibiae, and in a less degree the in- 

 termediate ones, are brown" (Walsh). 



Mr. Walsh reared many % 9 specimens from the gall of C. a. floe c I 



