﻿CHEMISTRY OF INSECT COLOURS. 247 



than the body, very scantily fringed at the base ; the scape rather short, 

 obconical ; the 3rd and 4th joints equal, each about one-third longer than the 

 scape, 5th a little shorter, 6th to 11th decreasing in length and thickness. 

 The thorax is cylindrical, much narrower than the elytra, constricted near 

 the base, but not narrower behind than in front, as in Eutceniopsis ; the 

 lateral spines sharp, their basal dilatation very slight. Elytra moderately 

 elongate, somewhat flattened above, rounded at the apes ; shoulders rectan- 

 gular. The anterior haunch-sockets are rather widely open behind. The 

 tarsal claws small and weak ; they are not so nearly parallel as in Eutceni- 

 opsis trifasciella, but at the same time they are not strictly divaricated. 



COSCINESTHES POROSA. 



Black, thinly clothed with coarse adpressed, reddish brown pile ; antennal 

 joints 3rd to 11th grey at the base, the length of the grey ring increasing 

 towards the apex. Head rather strongly punctured ; thorax coarsely granular ; 

 elytra granulated close to the base and on the shoulders, the rest of the surface 

 cribbled with mostly large, rounded and contiguous punctures or fovea? ; the 

 elevated parts of the surface are black and shining, and the under surface is 

 minutely spotted with black. Long. 21 millim. 



Wa-shan, alt. 6000 feet. One example. 



Batocera lineolata, Chevrolat. 

 Chia-ting Fu. Described by Chevrolat from examples received 

 from Shanghai. The species is found also in Japan and in 

 Formosa, and is subject to considerable variation both in form 

 and markings. 



Batocera davidis, Deyrolle, Ann. Soc. Ent. Fr. 1878, p. 131. 

 Chia-ting Fu. One example referred with some hesitation to 

 this species. 



Apriona rugicollis, Chevrolat. 

 Like Batocera lineolata, recorded originally from Shanghai and 

 subsequently proved to be not uncommon in Japan. Occurs also 

 at Amoy and other places in Eastern China. 



CONTRIBUTIONS to the CHEMISTRY of INSECT COLOURS 



By F. H. Perry Coste, F.C.S. 



IV. — Results (continued). 



EXPLANATION OF THE TABLES.* 

 " " signifies that the colour was unaffected. A single or double 



bracket enclosing the cipher, thus (0) ((Oj), slightly qualifies it; such 



must be read as " practically unaffected," &c. 



A dash signifies that no experiment was made in such cases. 



" Gone," is given as the result in some cases ; these were cases in 



which no definite colour change could be noted, but the original colour 



had certainly disappeared. Hepialus humull may be taken as a strikingly 



unsatisfactory instance in point. 



* There are included in these tables several species not really British (see 

 footnote, p. 222) ; but these are either occasional visitors or closely allied to lniiivo 

 , which I was unable to obtain. 



