374 Scale-like and Flattened Hairs of Lepidopterous LarvfB. 



four very irregular teeth. No strife are perceptible, and the 

 hairs throughout are pale, colourless, and transparent. 



On examining the lateral tufts of Gastropacha americnna I 

 found some similar very long hairs with the ends flattened 

 and of extraordinary form. These hairs usually project 

 beyond the simple hairs; some of them end in regular lanceo- 

 late-oval shapes with the point much attenuated, others are 

 broader, while some are oval and very broad at the truncated 

 end, which terminates in a fine attenuated point, at the base 

 of which are usually three attenuated teeth. They are 

 similar in shape to those of Gaslropncha quercifolla. 



On turning over the beautiful plates of Burmeister's ' Atlas 

 of the Lepidoptera of the Argentine Republic ' I found that 

 the author represents on pi. xxii. fig. 9 the similar long hairs 

 of Clisiocamjia proxima. They are much more regular than 

 any I have seen, and are much flattened and expanded at the 

 ends, with from three to five long slender teeth. They are 

 also represented as striated longitudinally, with either beads 

 or clear spots in the expanded portion. These hairs are 

 visible to the naked eye. Burmeister remarks (p. 52) that 

 Stoll has figured (Suppl. dc Cramer, pi. xix. fig. 5) a similar 

 larva with the same kind of hairs, h palmetle terminale^ 

 situated on the first and last segments of the body. He names 

 it Bonihyx ephomia (pL xxxv. fig. 6, of the same volume). 

 "Walker refers this species with doubt to the genus Oxipenis. 

 ]>urmeister adds : " Some other species of the genus Clisio- 

 Ciivq^a have the same kind of hairs placed at each end of the 

 body." 



1 have been unable to discover these flattened hairs in 

 Clisiocampa americana or in C. neustria of Europe. In 

 C. kylvatica the hairs on the lateral thoracic tubercles are 

 ta])ering and finely barbed, with scattered, slender, spike-like, 

 smooth, simple setaj. Perhaps the latter are the homologues 

 of the flattened set£e. In Ileteropacha Rileyana of the central 

 United States there are no dorsal tufts, and consequently no 

 dorsal scales like those of its ally Gastropacha ; but certain 

 of the hairs in the lateral tufts are flattened at the end, wiiicli 

 is very long and slender and lanceolate-oval, with the tip 

 much attenuated *. 



In the Noctuina these hairs with flattened ends probably 

 occur in nearly all the hairy and pencilled species. In the 



* In Tolype velleila there are no such scales or hairs with llattened ends 

 as in Gadropocha ; those on the dorsal tubercles of tbe thoracic and ei^rhth 

 abdominal segments being simple, tapering, vrith large, scattering, sjiike- 

 like, dark, opaqut> seta-, these latter being perhaps the homuloguos of" the 

 dark scales of Gdsiivjxwlia. 



