22 PROCEEDINGS OF THE ACADEMY OF [Part I 



MICROPTERYGIDAE. 

 ACANTHOPTEROCTETES new genus. 



Labial palpi very short, directed outwardly. Maxillary palpi 

 long, filiform, folded. Tongue short. Head densely rough-haired. 

 Antennae four-fifths, slender, filiform, smoothly scaled, basal seg- 

 ment sHghtly swollen. Middle tibiae with one apical spur, posterior 

 tibiae smooth, middle and apical spurs long. 



Fore wing: elongate lanceolate, fibula large, second and third 

 anal veins separate and distinct to the margin, Cu and 1st A co- 

 alesced at base, posterior arculus distinct, Cui and Cih distant, 

 base of media distinct, not forked within the cell, forming an almost 

 straight linewith M3 + 1, transverse vein perpendicular between Cih 

 and 1/3 + 4, and nearly meeting the very oblique transverse vein 

 between M3 + 4 and /?4 + 5, which becomes obsolescent near Afs + 4, 

 M2 arising near the middle of the oblique transverse vein, Mi from 

 middle of stalk of i?4 and Es, R4 and R^ long stalked, R^ to apex, 

 R2 + 3 coincident, from near end of cell, Ri from before middle, with 

 an accessory vein, Sc not forked, humeral vein present. 



Hind wing: elongate lanceolate, 

 a little narrower than the fore 

 wing, without frenulum, but with 

 series of costal spines, venation 

 similar to that of the fore wing, 

 with the exception of the anasto- 

 mosis of the first and second anal 

 veins near the base, the absence of the transverse vein between 

 Cui and M3 + 4, absence of accessory vein from Ri. 



Genotype, Acanthopteroctetes tri-punctata n. sp. 



The forking of the base of media nearer to the margin than in 

 other Micropterygid genera has resulted in a nearly straight discal 

 vein, and a consequent configuration of the discal cell similar to 

 that in other Lepidoptera. The presence of three separate anal 

 veins in the fore wing is an unusual feature. The presence or ab- 

 sence of a cross-vein between the first and second anal veins of the 

 fore wing could not be observed without injury to the unique type. 



This genus belongs in the subfamily Eriocranianae, but is not 

 closely related to any described genus. It is nearest to Eriocrania. 



In addition to the species described below, I have a single speci- 

 men, in rather poor condition, of another species of this genus from 

 the southern iSierras. 



