70 HYMENOPTEEA. 



being widest at the top ; the lower half of the wing to the middle fascia and the apex 

 are milk-white. The posterior wings are almost hyaline, the upperside at apex only 

 being smoky. 



PETIOLIVENTRIA. 



DITROCHA (Teeebeantia). 

 Fam. CYNIPID-E. 



Subfam. GALLICOLINjE. 



CYNIPS sensu lot. 

 The three species of gall-making Cynipidae which inhabit Central America are only 

 known from their galls, so that it is impossible to say to what genus the makers 

 of these belong ; and although Dr. Karsh describes the upheaver of the gall he 

 records from Mexico, I cannot, from his description, refer the species described by him 

 with precision to any of the modern genera. 



1. Cynips setifer. 



Diplolepis setifer, Karsch, Zeitschr. f. d. ges. Naturw. liii. p. 291, t. vi. f. 2-2a-d 1 . 

 Hab. Mexico 1 . 



2. Cynips championi. 



The gall is broader than long, having a breadth of about 2J inches and a 

 length of 2 inches, the surface irregularly indented, of a leathery texture, and so 

 hard that it can be cut only with difficulty ; the inside is also hard and is of a close 

 compact spongy nature. Its colour closely resembles that of the twigs. Intersected 

 through it at irregular intervals are oval cells about 1J millim. in length. The outer 

 margin of the cells is hard, woody, and white. Besides the numerous exit-holes of the 

 gall-flies there was a larger one which, at a short distance from the outer skin, bifurcated 

 into two tunnels ; these were filled with " frass," and in one of them was found a silken 

 case, white and smooth internally, but covered with " frass " on the outside, clearly the 

 case of some Microlepidopteron. The gall is situated at the end of a twig about 3 

 millim. in diameter. It is said by Mr. Champion to be common in Chiriqui on a 

 species of oak. The maker is unknown to me. 



3. Cynips imitator. (Tab. IV. fig. 8, gall.) 



Rah. Guatemala, San Geronimo (Champion). 



The largest galls have a diameter of 26 millim. In form they are more or less 

 roundish, but, if any thing, longer than broad ; they are situated on a twig or small 



