406 ^Ir. II. Druce on 



Carapace, rostrum includecl, two thirds the lengtli of the 

 ahdonien. Carapace scahriculate on its anterior half. Ros- 

 trum shorty reacliinf^ to the middle of penultimate joint of 

 antcnnular peduncle, arisinp; from the anterior third of the^ 

 carapace ; it is directed ohh'qnely doicntcard, the acute tip 

 situated at a much loicer level than the upper surface of the 

 carapace. Upper border armed with seven or six teeth that 

 reach to the tip ; first tooth situated at one fifth of the 

 carapace from the frontal border ; three teeth on the carapace. 

 Lower border nearly straight, witli one or two teeth, situated 

 near the anterior tooth of the upper margin. Upper limb of 

 the rostrum, in the middle, little higher than lower. An- 

 tennal spine small ; hepatic spine extremely small, sometimes 

 even icanting altogether. 



Carpus of legs of first pair as long as the merus and one 

 third longer than the chela. 



Leg of second pair, apparently the smallest, twice as long 

 as carapace, rostrum included, extending with one fourth of 

 the carpus beyond the scales. Carpus somewhat sAor^e?* than 

 nieius ; chela three times as long as the carpus, palm very 

 Utile shorter than the Jiugers, and slightly compressed in 

 the proportion of 3:4. Palm barely broader than carpus. 

 Fingers probably somewhat tomentose, shutting close to- 

 gether ; the fixed finger carries a low denticulate prominence, 

 the dactylus a somewhat compressed conical tooth between 

 the articulation and the small tooth at the end of the cutting- 

 edges. Leg covered with minute spinules. 



Following legs moderately slender. 



Length 61 mm.; carapace 26 mm. long. 



Daijeeliug, Bengal ; fresh water, at a height of 2500 feet. 



LY. — Descriptions of some new Species of Heterocera from 

 Peru. By Herbert Druce, F.L.S. &e. 



Family Arctiidae. 



Thyrarctia friga, sp. n. 



Male. — Head, antennae, collar, tegulae, and front of thorax 

 dark brown ; palpi yellow ; the base of the thorax and first 

 segment of the abdomen yellow ; the upperside of the abdo- 

 men and anal tuft daik brown, the underside white ; legs 

 dark brown. Primaries dark brown, with a large yellowish 



