REPORT OF THE STATE ENTOMOLOGIST 1918 
APPENDIX 
A STUDY OF GALL MIDGES, VII 
Famity IToNIDIDAE 
Tribe Itonididinariae (Continued) 
SI 
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. 
Rubsaamen, E. H. Wien. Ent. Zeit., 14:189 
Kieffer, J. J. Wien. Ent. Zeit., 15:92 
1895 
1896 
SOs 
Felt, E. P. N. Y. State Mus. Bul. 124, p. 403 
Synopse d. Cecidomyies d’Europe et d. Algerie, p. 29 
1908 
1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:285 
1911 Felt, E. P. N. Y. Ent. Soc. Jour., 19:57 
1913 Kieffer, 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 (pl. 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.vitis 
Rubs. 
We have in this group a number of small, yellow- 
ish forms. It is probable that most of the species 
are zoophagous, though A. apiphila, believed 
at first to subsist upon organic débris in beehives, 
may in reality have been preying upon mites. The 
head and the anterior body segments are usually 
greatly produced in the larva. S 
Key to Species 

Fig. 3  Arth- 
rocnodax spe- 
cies, fifth an- 
tennal segment 
of male (en- 
larged, original) 
@ 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 Circumfila heavy, thick, the dorsal plate deeply and triangularly 
incised, the ventral plate short, narrowly rounded 
