624 



AN INTRODUCTION TO ENTOMOLOGY 



This family is represented in this country by a single species, 



Tinagma obscuro- 

 Sc j^ fasciella, the larva 



of which is a leaf- 

 miner in Rosaceas, 



Family 

 (ECOPHORID^ 



The head is usu- 

 ally smooth, with 

 appressed scales; 

 sometimes with 

 loose scales and 



(After spreading side tufts. 

 The antennas usu- 



The labial palpi are well- 



Fig. 765. — Wings of Tinagma obscurofasciella. 

 Chambers.) 



ally have a comb of bristles on the scape 



developed, generally curved upward; the terminal segment is acute- 

 ly pointed. The maxillary palpi are vestigial. The wings are fairly 

 broad, sometimes ample 



Sc /? 



M, 



(Fig. 766). The venation 

 is but little reduced. In 

 the fore wings veins R4 

 and R5 are stallced or co- 

 alesce throughout; veins 

 R2 and Cu2 arise well 

 back from the end of the 

 discal cell; and vein ist 

 A is preserved. In the 

 hind wings veins Rs and 

 Ml are well separated and 

 extend parallel. The 

 posterior tibice are cloth- 

 ed with rough hairs 

 above. 



The larvas have sixteen legs; they are often prettily marked with 

 dark tubercles on whitish or yellowish ground. The different species 

 vary in their habits; the majority of them either live in webbed- 

 together leaves or blossoms or feed in decayed wood; one species, 

 Endrosis lacteella, is a stored-food pest in California and in Europe. 



About one hundred species have been described from our fauna ; 

 many of them are common. A generic revision of the American 

 species was published by Busck ('09 a). The following one is a well- 

 known pest. 



The parsnip webworm, Depressdria heraclidna. — The larvae of this 

 species web together and devour the unfolding blossom-heads of 

 parsnip, celery, and wild carrot. After the larvas have consumed the 

 flowers and unripe seeds and become nearly full-grown, they burrow 



id A 

 Fig. 766. — Wings of Depressaria heracliana. 



