160 MR. F. WALKER ON HETEROCEROTJS LEPTDOPTERA 



their organization, cannot possibly contribute to the formation of 

 a vacuum. 



The foregoing solution of this interesting physiological problem, 

 I have reason to believe is applicable not to insects and Spiders 

 alone, but also to some species of reptiles. 



Catalogue of the Heterocerous Lepidopterous Insects collected at 

 Sarawak, in Borneo, by Mr. A. E. Wallace, with Descriptions 

 of New Species. By Fbancis Walker, Esq., F.L.S. 



[Continued from p. 84.] 



Gen. Abtioisa, n. g. 



Mas. Corpus vix robustum. Proboscis conspicua. Palpi subarcuati, 

 verticem pauUo superantes ; articulus 3"^ lanceolatus, 2" brevior. An- 

 tennee setis longiusculis instiucta;. Abdomen alas posticas non supe- 

 rans; fasciculus apicalis parvus, compressus. Pedes robusti, pilosi, fe- 

 moribus tibiisque anticis dense pilosis, calcaribus longis. Alts anticae 

 apice subrotundatse, costa recta, margine exteriore vix convexo sat 

 obliquo. 



Male. Body hardly stout. Proboscis distinct. Palpi slightly curved, 

 rising a little higher than the vertex; 3rd joint lanceolate, much 

 shorter than the 2nd. Antennae with rather long bristles. Abdomen 

 not extending beyond the hind wings ; apical tuft small, compressed. 

 Legs stout, pilose ; fore femora and fore tibise densely pilose ; hind 

 tibiae with four long spurs. Wings moderately broad. Fore wings 

 slightly i-ounded at the tips ; costa straight ; exterior border hardly 

 convex, rather oblique. 



354. Artigisa nigrosignata, n. s. Mas. Ochraeeo-cinerea, alis 

 fascia media e atomis nigris, lineis exteriore et submarginali undulatis 

 lunulisque marginalibus nigris, alis anticis lituris costalibus, plaga 

 basali fasciaque exteriore nigris. 



Male. Cinereous, tinged with dull ochraceous, paler beneath. Fore 

 legs partly black. Wings with a few black speckles, which form a 

 very incomplete middle band ; exterior line black, slender, distinct, 

 undulating, bent in the fore wings ; submarginal line undulating, much 

 less distinct; submarginal lunules black, forming a festoon with the 

 marginal line. Fore wings with black marks along the costa, and 

 with a black basal patch formed of confluent speckles ; a black band, 

 broadest by the costa, partly contiguous to the outer side of the ex- 

 tei'ior line, and traversing the submarginal line; this band is diffuse 

 hindward, aud emits a diffiise streak from its exterior side. Length 

 of the body 4 lines ; of the wings 10 lines. 



Gren. Veia, n. g. 

 Mas, Corpus vix I'obustum. Proboscis conspicua. Palpi comjjressi. 



