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TEXT-BOOK OF ENTOMOLOGY 



many Coleoptera (Curculionidae, Cleridse, Ptinidse, Dermestidse, 

 Byrrhidse, Scarabeeidce, Elateridte, and Cerambycidae), and in the 

 Culicidae, and a few other Diptera, though they are especially char- 



1 



T> 



^ 



7. 



Fio. 221. Flattened and spinulated hairs of tufts of larva of Acronyota hastulifera. 



acteristic of the Lepidoptera, not a species of this great order being 



known to be entirely destitute of them. 



The scales vary much in shape, but are more or less tile-like, 



attached to the surface 

 of the body or wing by 

 a short slender pedicel, 

 and are more loosely 

 connected with the in- 

 tegument than the hairs, 

 which are thicker at the 

 base or insertion than 

 beyond. 



The markings of the 

 scales, both of Synaptera 

 and Lepidoptera, are 

 very elaborate, consist- 



ing of raised lines, ridges, or striae with transverse ridges between. 



" The striae of the transparent scales of Micropteryx are from about 



500 to 300 to the millimetre, varying in different species. The 



Fio. 222. Scales from dorsal tuft on second thoracic 

 segment of larva of Qastropaeha querc/'J/i/in. 



