85] LEPIDOPTEROUS LARVAE — FR ACKER 85 



Gelechia trialbamaculella, G. cercerisella, G. hibiscella, G. unctulella, 

 G. macuUmarginella, G. pseudacaciella, and G. serotinella of 

 North America, and G. atriplicella, G. acuminatella, G. rhom- 

 hella, and G. mulinella of Europe. 



Family Oecophoridae 



This is one of the families formerly included in Gelechiidae and the 

 larvae are so similar to the latter that no satisfactory character has 

 been found to distinguish the two groups. They seem to divide along 

 the same lines on the basis of the position of rho on segment 8 of the 

 abdomen. In all the species seen the adfrontals extend to the vertical 

 triangle, the prolegs are short and stout and bear a complete circle of 

 biordinal crochets and the prothoracic shield is lightly chitinized. The 

 fourth ocellus is always much closer to the third than to the sixth, and 

 the second is always farther from the first than from the third. Other- 

 wise the characters are the same as in Gelechiidae. 



Depressaria is the best known genus in the family. As a rule the 

 setae are located on heavily chitinized pinacula, often elevated and 

 chalaza-like ; kappa and eta of the abdomen are borne on a small pinacu- 

 lum directly ventrad of rho, eta being located cephalodorsad of kappa 

 on the first two or three abdominal segments ; rho on segment 8 is always 

 a little above the level of the top of the spiracle, tho located farther 

 cephalad on the segment. Depressaria heracliana and Z>. cinereocostella 

 of America and D. depressella of Europe were seen. 



Agonopteryx Hiibner has recently been separated from Depressaria 

 altho the difference between the two is very slight in any stage. This 

 genus agrees with all the characters given in the preceding paragraph 

 except that eta is cephaloventrad of kappa on the first two or three 

 abdominal segments. The species examined were A. umhraticostella, 

 A. lythrella, and A. posticella, all of North America. 



Machimia tentoriferella is a larva with indistinct and slightly chit- 

 inized setae and with obscure or absent pinacula; rho on segment 8 is 

 cephalad of the spiracle and at the same level ; kappa and eta are below 

 the spiracle and located farther caudad than rho. 



Psilocorsis quercicella and P. obsoletella, formerly included in 

 CryptolecMa, are closely related to the other two genera mentioned and 

 their characters indicate an intermediate position. The pinacula are 

 distinct, rho on segment 8 is directly cephalad of the spiracle and kappa 

 and eta are on a pinaculum ventrad of rho. 



Oecophora similella, Dasystoma salicella, and Chimahache fagella, 

 of Europe, are similar in all important particulars to the American 

 forms. 



