218 



PSYCHE. 



[May—July iSSg. 



extend to the collar. Another slightly 

 depressed line begins on either side of 

 the thorax near the base of the wings 

 and runs towards the scutellum. Thorax 

 and scutellum with the same scaled 

 appearance as the epicranium. Scu- 

 tellum broad as long, obtusely rounded 

 posteriorly and with two shallow fovae 

 at base. Wings : areolet small and in- 

 distinct ; cubital nervure rather faint ; 

 cross veins rather heavy ; radial nervure 

 not reaching the costal margin. Length, 

 2 mm. Abdomen : the large second 

 segment occupies about one-third of the 

 abdomen ; all of the segments punctured 

 and set with many short gray hairs. 

 Length of insect 3 mm. 



BURR OAK {^iiercus macrocarpa^. 

 Acraspis villosus n. sp. 



Gall : Hard globular excrescenses on 

 the under side of the leaves and always 

 attached to the midrib. (Fig. 4) Me- 



Fig. 4. 



dium sized specimens measure 5-16 

 of an inch in diameter. The galls 

 resemble rather closely the galls of ^. 

 erinaceae but differ from it by having a 

 much heavier pubescense, by always 

 being single-celled and by being light 

 yellow in color. 



Gall-fly : Sub apterous females only 

 have been reared. 



Head : Median line of face, includ- 

 ing clypeus, vertex and occiput, black. 

 Orbits and genae dark cinnamon brown. 

 In dark specimens nearly the entire face 

 is black. Jaws and terminal joints of 

 palpi black. Head and mouth parts 

 sparsely pubescent". Epicranium, bor- 

 dering clypeus, rugose ; remainder of 

 head punctate. Thorax, brown, bor- 

 dered anteriorly and posteriorly with 

 black. Parapsidal grooves wanting. 

 Thorax and scutellum jDunctate and 

 finely pubescent. Abdomen thickly set 

 with a yellowish-gray pubescence that 

 gives a decided velvety lustre to the 

 sides of the abdomen. The anterior 

 dorsal portion of the second segment has 

 a large bare spot that is continued in a 

 narrow line back over the succeeding 

 segments. The borders of the segments 

 show as black rings crossing the velvety 

 surface. Legs, brown ; tarsi infuscate. 

 Antennae 13-jointed ; third joint longest ; 

 last joint as long as the two preceding, 

 and all of the joints rather densely 

 haired. Length, 4 mm. 

 Neiiroterus nigrum n. sjd. 



Galls : The galls are little pimples 

 about 3 mm. in diameter on the surface 

 of the leaves (Fig. 5) and show equally 

 well from above and below. There are 



