Dec. 1900.] BuscK : New Species of Tineina. 237 



Tridonella pergandeella, sp. nov. (Plate IX, Fig. 2.) 



Antenn;i; purplish black, with two silvery white, thin, longitudinal lines from base 

 to tip. Labial palpi black, second joint with four longitudinal thin silvery white 

 lines, terminal with one longitudinal white line in front. Tongue thinly scaled, 

 white. Face and head brownish black with a thin white line over the eyes. Thorax 

 clear light golden brown concolorous with basal part of fore wings. Abdomen pur- 

 plish black. Fore wings, basal half light yellow brown with a small black, white-edged 

 dot on the middle of the cell. The brown color extends along the costa into the apical 

 half of the wing, the ground color of which is purplish black, edged towards the brown 

 part by a thin white line. In the black part of the wing are scattered sparse white 

 scales segregating into a whitish spot near tornus ; basal part of cilia black sprinkled 

 with white scales, tips of cilia mouse gray. Hind wings purplish gray, darker towards 

 the tip ; cilia brownish. The venation of the hind wing shows more variation than is 

 generally found within a species. Whiie veins 3 and 4 are always stalked and 5 always 

 out of this stalk, the relative length of the branches and the stalk is very variable. 

 Legs purplish black, cox?s sprinkled with silvery scales ; hind tibiie with one broad 

 silvery annulation and with the outer spurs silvery white, inner spurs black ; tarsi with 

 indistinct silvery annulations. Alar expanse 14 mm. 



Habitat : District of Columbia. 



U. S. National Museum, type no. 5354. Cotypes in the colloc- 

 tions of Dr. Meyrick, and Lord Walsingham, England, Dr. Dietz, Miss 

 Murtfeldt and Professor Fernald. Described from many bred speci- 

 mens. The larva feeds on the common tick-trefoil, Mcibomia {^Des- 

 modiuDi) dillenii. 



The eggs are laid singly on the underside of a leaflet and the larva 

 lives in a roomy inclosure between two leaflets spun together. When 

 full grown it is about 12 mm. long, cylindrical, slightly depressed and 

 tapering fore and back. Legs normal ; head is yellow with a black 

 spot over the eye and one on top ; body black marked with yellow as 

 follows : Anterior half of first thoracic joint ; a continuous dorsal spot 

 and two lateral spots on second and third thoracic segments ; two 

 small dorsal dots on segments 5, 6 and 7 (counting head as first joint); 

 joints 8 and 9 have the same two dorsal spots larger and more con- 

 spicuous besides two lateral spots, one on each side. End of body all 

 black ; entire body clothed with rather short sparse white hairs. 



Dr. Dyar has given me the following description : 



" Head rounded, elongate, the lobes full ; clypeus high, the paraclypeal pieces 

 narrowly reaching the vertical triangle ; labrum longer than wide, projecting, 

 emarginate ; surface shagreened ; setse pale, some long, others short ; pale luteous, 

 a black patch at top of lobe next suture, and a broad blotch on the lower angle 

 of cheek behind ocelli ; ocelli weak, in a black p tch ; antenna; moderate, pale. 

 Thoracic feet large ; abdominal ones small, slender, normal, the crochets in a com- 

 plete small circle, smaller and almost broken on the outer side ; in a single row on the 



