382 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



and they are attenuated at the base into a short petiole which is 

 fastened to the midrib of the leaf; the opposite end is an excav- 

 ated truncature; the length of the galls from the end of the 

 petiole to the opposite end is 3-4 mm. They grow in num- 

 bers, so that at times there are ten or more together, with six, 

 for instance, forming a row on one side of the midrib, and four 

 or five on the opposite side. 



P. macrocarpae Bassett. 



Length 3 mm.; head black, antennae black, 14- jointed, nearly 

 as long as the body, the first joint ovate, the second oval, the third 

 twice as long as the two preceding taken together, the fourth, fifth, 

 sixth and seventh subequal, as are the remaining ones; face and 

 cheeks hairy ; thorax appearing grayish owing to its being covered 

 with short appressed hairs, parapsidal grooves present but obscured 

 by these hairs; scutel comparatively large and elevated posteri- 

 orly, nearly as long as the mesonotum ; wings veinless, the narrow 

 scales as long as the entire thorax ; legs dark brown, claws with 

 two teeth ; abdomen black, compressed from side to side, sides 

 of the second, third, fourth and fifth segments covered with short 

 appressed hairs, dorsal and ventral parts and the segments of the 

 apical portion of the abdomen smooth and shining. 



The galls of this species are oval in form and nearly 4 mm. 

 long by 3 mm. thick. They are generally found on the lateral 

 veins on the under side of leaves of Quercus macrocarpa, but 

 occasionally they are found on the upper side. They are attached 

 lengthwise to the vein and the point of attachment is about 2.5 

 mm. long. The opening made by the gall-fly when it emerges is 

 invariably on the end towards the base of a vein. The same is 

 often true concerning parasites of this species. 



P. prinoides (Beutenmuller). Cynips ? prinoides Beuten- 

 muller. Spiny Oak Gall. 



Length 3.5 mm. ; head pitchy black, opaque, rugosely punc- 

 tate ; eyes surrounded with a rather broad reddish brown ring, 

 antennae black, 13-jointed, with the first, second, third and fourth 

 joints elongate and about equal in length, the remaining joints 

 subequal in size ; thorax dull reddish brown, darker in color at 

 the sides and deeply but finely punctate ; legs shining, reddish 

 brown and with a few short yellowish hairs which are also 

 present on the head and thorax; abdomen jet black and polished; 



