1 1 



/'.s ; "( HE. 



i M;iy — ^_|unL- iJvS^i- 



ill ;i ilrv-goods store in Leipzig, Gci- 

 niaiiv. funiislics interesting forms of 

 sciiles. Tiiis colcopteron Is clothed with 

 brown hairs, one of whicli is figured 

 (lig. 9, 1) and among liiese hairs are 

 scales (fig. 9, a and h). The relative 

 size of the hairs and scales of this spe- 

 cies of Ptinns may be seen from fig. 9. 

 where both are drawn enlargeil 100 di- 

 ameters. These scales have from two 

 to seven long apical points, are actachcd 

 by a little stem at the base, and are 0.06 

 to 0.09 mm. in length by o.oi to 0.03 

 mm. wide. Their color is liglit brown, 

 which is apparentlv produced, for the 

 most part, bv somewhat irregular longi- 

 tudinal stripes or lliickenings upon the 

 inner surface of tine scales. riiese scales 

 are lilletl with air. 



improved in depth of color b\- being 

 clollied with black scales. The yellow 

 stripes upon the thorax are produced en- 

 tirclv by vellow scales which are set 

 upon a black background. Tiie whole 

 riciiness of coloration of C. robiniac is 

 produced by the scales with which it is 

 clothed, as can perhaps be most strik- 

 i'.igh' illustrated bv removing the scales 

 from one half of a specimen and leaving 

 the other iialf intact. In the same way 

 the gromul color of the European Sap- 

 crda scalaris is black, its beautifid col- 

 oration being due to a dense coating of 

 scak-llke iiairs. 



\ 



n 



Fi^. 9. Scnlcs :liul h:iir of /'//;///\ f ruiiluf^: ti-xnAb, 

 sc:iU-s from fUlmn • - , liiir ft.. in fUrron. Knlarjfud kk) 

 ili:iin. 



SCAI.KS OK Cl.V'ltS ROIilNIAi;. 



NearK ail tile \ello\v sliipes upon C. 

 rol>i?iiac owe tiieir entire coloration to 

 the scales with which they are covered. 

 This can be seen best by scraping all the 

 scales from the insect, after which, with 

 the exce])tion of the legs and a few yel- 

 low stripes on the elytra, it is black. Most 

 black [jarts of the insect are. however. 



Fij;. 10. Scale of C/j'/tis rohiniac. EiilaruL-d uxi 



iliaiM. 



rhi' black or brown scales from the 

 upper surface of the thorax or from the 

 elytra of C. robiniac resemble, at first 

 glance, tiiose of Alms or»/:itiis. but 

 upon closer examination tliev prove to 

 be quite ditferent. Their form is approxi- 

 mately an elongated parallelogram (see 

 fig. 10), vvitli the shank or point of at- 

 tachment at one of the acute angles. 

 The striae originate at and near the 

 shank and terminate along the opposite 

 end of the scale, thus iliiVering entirely, 

 in this respect, from the scales of A/aiis. 



The scales of C. robiniac are o. i ^ to 

 o. iS mm. long by about 0.02 mm. vyide. 

 Under the microscope they are dark 

 brown or ligiit yellow, according to 

 whether they are from tlie black or yel- 

 low parts of the insect. Hoth the yellow 



