REPORT OF THE STATE ENTOMOLOGIST I918 81 



APPENDIX 



A STUDY OF GALL MIDGES, VII 



Family Itonididae 

 Tribe Itonididinariae (Continued) 

 The first part of the discussion of this large and extremely variable 

 tribe appears in State Museum Bulletin 202, pages 76 to 205. There 

 will be found on page 76 a discussion of the tribal characteristics 

 and on pages 76 to 81 there is a key for the separation of all genera 

 of the tribe, including those discussed below. 



ARTHROCNODAX Rubs. 



1895 Rubsaamen, E. H. Wien. Ent. Zeit., 14: 189 



1896 K^effer, J. J. Wien. Ent. Zeit., 15:92 



1897 Synopse d. Cecidomyies d'Europe et d. Algeria, p. 29 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 403 



1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:285 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19:57 

 1913 Kieflfer, J. J. Gen. Insect., fasc, 152, p. 155 



This genus may be recognized by the third vein uniting with 

 costa well before the apex of the wing (pi. 16, fig. 7). 

 The antennae are composed of fourteen segments, 

 binodose in the male (fig. 3), the palpi quadriartic- 

 ulate and the claws simple. The basal clasp segment 

 of the male has a more or less developed tooth at the 

 internal basal angle. The ovipositor is short and 

 apically with two large lamellae. Type A . v i t i s 

 Rubs. 



We have in this group a number of small, yellow- 

 ish forms. It is probable that most of the species Fig. 3 Arth- 

 are zoophagous, though A. apiphila, believed ^^^^^^^f^^y^ ^^^' 

 at first to subsist upon organic debris in beehives, tennal segment 

 may in reality have been preying upon mites. The °^ ™^^^. M^' 

 head and the anterior body segments are usually 

 greatly produced in the larva. 



Key to Species 



o The two parts of the stems of the fifth antennal segment of the male plainly 

 unequal 

 b Basal portion of the stem with a length less than its diameter 



c Circurafila heavy, thick, the dorsal plate deeply and triangularly 

 incised, the ventral plate short, narrowly rounded 



