LE1>ID0PTERA HETEROCERA. 305 



undulating, diverging towards the costa ; fourth line diffuse. Hind 

 wings with the first line obsolete; second and third lines apparent; 

 fourth line indicated by a short broad streak near the interior angle. 

 Length of the body 8 — 9 lines; of the wings 22—24 lines. 



a, b. Canada. Presented by W. S. M. DUrban, Esq. 



3. Biston Mexicanarta. 



Mas. Fuseescente-olivacea ; caput album ; palpi nigri; alee an- 

 ticce nigro conspersa, lineis duabus transversis albis, gutta ni- 

 gra maculaque albida diffusa discalibus contiguis, fimbria alba 

 nigro punctata; posticce cinerea?, fusco compersa, gutta discali 

 nigra. 



Male. Brownish olive-colour. Head white. Palpi mostly 

 black. Fore wings transversely and irregularly speckled with black, 

 with two white transverse lines, along part of which the speckles are 

 confluent ; a black discal dot with a diffuse whitish spot on its inner 

 side ; fringe white, with black points opposite the veins. Hind 

 wiugs cinereous, minutely speckled with brown ; discal dot black. 

 Length of the body 8 lines ; of the wings 18 lines. 



a. Mexico. From Mr. Glennie's collection. 



Genus 8. AMPHTDASYS. 



Corpus crassum. Frons plana, bicolor, non hirsuta. Proboscis 

 et palpi distincti, brevissimi. Antennae validae. Thorax brevis, 

 latus, lanuginosus. Pedes robusti ; tibiae posticee calcaribus quatuor 

 approximatis. Alee spissae, opacae ; anticae elongatae, apice rotun- 

 datae, costa recta, margine exteriore perobliquo. Mas. — Antennae 

 plus minusve pectinatae. Abdomen conicum. Fcem. — Antennae sim- 

 plices. Abdomen longius. 



Amphidasys, Treit. Schm. i. 229. Dup. ; Boisd. ; Led. ; Guen. Phal. 



i. 206. 

 Eubyja, Hubn. Verz. Schm. 318. 



Body thick. Front flat, of two colours, not hirsute. Proboscis 

 and palpi distinct, but very short. Antennae stout. Thorax short, 

 broad, lanuginous. Legs stout; hind tibiae with four approximate 

 spurs. Wings stout, opaque. Fore wings elongate, rounded at the 

 tips ; costa straight ; exterior border very oblique. Male. — An- 

 tennae more or less pectinated. Abdomen conical. Female. — An- 

 tennae simple. Abdomen cylindric-conical. 



d3 



