174- 



rnckanl.] -^ • ^ [March 17, 



Fig. 15 — Scales from the dorsal thoracic tufts of Gastropaclia querdfoUa. 



Fig. 16. — Hairs -with flattened ends, all from a single lateral tuft, a, a 

 hair ending in two slender points, the only one seen. 



On examining the lateral tufts of Gastropncha americana, I found 

 some very long similar hairs flattened at the end and of extraordinary 

 form, usually projecting beyond the simple hairs ; some ending in regu- 

 lar lanceolate-oval shai)es, with the point much attenuated, others broader, 

 while some are oval and broad at the end, which terminates in a fine atten- 

 uated point, with usually three minute teeth at the base. Thej^ are 

 similar in shape to those of Qastropacha quercifolia. 



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

 pidoptera of the Argentine Republic, I found that the author represents 

 on Pi. xxii, Fig. 9, similar long hairs, much flattened and expanded at 

 the ends, with 3, 4 or 5 long slender teeth, in the larva of his Ulisiocampa 

 proxima,* which, however, seems to differ from Clisiocampa proper. The 

 hairs are visible to the naked eye, and are much more regular than any I 

 have seen, and are also striated, with beads or clear spots. 



In G. americana, the scales forming the dorsal tufts both on the two 

 hinder thoracic segments and on the eighth abdominal one are very dif- 

 ferent from those of the European species ; they are dark and opaque, but 

 are long, narrow, flattened, very gradually increasing in width to the end, 

 which has a single notch, and from the single notch an impressed line or 

 stria extends along the middle for some distance. 



Fig. 17. — Scales from the tuft on the dorsal tubercle of the eighth ab- 

 dominal segment, a, the setie X ^ in. obj.; b, c, similar ones Xl A 

 eyepiece. 



Fig. 18. — Flattened hairs from the lateral tufts of the second and third 

 thoracic segments of G. americana, color pale brown. 



These flattened hairs seem common to the family of Lasiocampidaj, and 

 should be looked for in the European species of this group. In Hetero- 

 pacha rileynna there are no dorsal scales, but some of those in the lateral 

 tufts have flattened ends, which are very long and slender, lanceolate-oval, 

 with the tip much attenuated. 



Fig. 19. — Flattened hairs from the lateral tufis of the second thoracic 

 segment of //. rileyana. 



I have been unable to discover these singular scales and flattened hairs 

 in Cliniocampa americana,\ox G. neustria of Europe, or in any other family 



• Burmeister (p. 52) remarks : " Stoll has figured (.Suppl. de Cramer, PI. xix. Fig. 5) a 

 similar Uxrva witli tlie same hairs, d pabwite terminale, situated on tlie first and last 

 rings of the body." lie names it Bombyx cphonia (PI. xxxv, Fig. 0, of the same volume*. 

 Walker refers this species with doubt to tlie genus Oxytenis. Burmeister adds : " Some 

 other species of the genus Clisiocampa have the same hairs placed at the two ends of 

 the V)ody." 



tin C. sylvatica the hairs on the lateral thoracic tubercles are tapering and finely 

 barbed, with scattered slender spikes like smooth simple setse. 



In Tolype velleda there are no such scales or hiiirs with flattened ends as in Gastro- 

 pacha, those on the dorsal tubercles of the thoracic and eighth abdominal segments 

 being simple, tapering, with large scattering spike-like dark opaque setaj, these latter 

 being perhaps the homologues of the dark scales of Gastropacha. 



