295 



Kieffer bases separation of the larvae of Cecidomyiinae from 

 those of Lestremiinae and Heteropezinae on the situation of the anal 

 opening, which in the former is on the ventral surface of the apical 

 segment, while in the other two subfamilies it is situated at the 

 extremity of that segment. No character for the separation of 

 Lestremiinae and Heteropezinae is given in his subfamily key, nor 

 are there any tangible distinctions mentioned in his discussion of the 

 larvae of these subfamilies. No attempt has been made, to my knowl- 

 edge, by any writer to designate characters for the separation of the 

 pupae of the different subfamilies. 



Retinodiplosis pini-inops Osten Sacken 



Cecidomyia pini-inops Osten Sacken, Stett. Ent. Zeit., 1861, p. 418. 

 Retinodiplosis pini-inops (Osten Sacken) Kieffer, Gen. Ins., Fasc. 152, p. 221. 

 (1913) 



Larva. — (PI. XLIV, Fig. i). Length 8 mm. White (alcoholic 

 specimens), head and spiracles black. 



Head consisting of a chitinized frame with enclosed membranous 

 areas (PI. XLIV, Fig. 6) ; antennae slender, 2-jointed, rather small. 

 Thoracic segments with a transverse series of short black hairs near 

 anterior margin on dorsum, the ventral surface of each segment with 

 several small rounded elevations ; prothoracic spiracles larger than the 

 abdominal pairs. Spatula present but not as heavily chitinized as in 

 most allied genera (Fig. 12). Dorsum of first seven abdominal seg- 

 ments each with a transverse pair of pseudopod-like processes the 

 apices of which are bifid, each branch with a slender black bristle ; a 

 bifid process similar to processes of dorsum, but shorter, situated just 

 ventrad of each spiracle; venter with 2 transverse series of short, 

 rounded elevations.; apical segment not elongated, spiracles (Fig. 9) 

 larger than lateral pairs of other segments, situated on upper posterior 

 margin and rather widely separated. 



Pupa. — Unknown to me. 



The foregoing description was made from specimens sent me by 

 Dr. E. P. Felt, which were obtained in New York State, April 25, 

 19 1 6. The larva does not agree with the characters cited for the larva 

 of Retinodiplosis by Kieffer in the paper cited under the species head- 

 ing here, but without material representing the other species for com- 

 parison I can not venture an opinion as to the exact generic status of 

 pini-inops. The structure of the head agrees closely with that of 

 Cecidomyia resinicoloides. 



