264 Mr. G. J. Arrow on Sexual Dimorphism in 



^ . Elytris nigris, interdum niaculislparvis humeralibus, lateralibus 

 et ai>icalibus punctato-striatis, interstitiis subtiliter punctatis ; tibiis 

 anticis tridentatis, tarsorum anticorum unguiculi divisione inferiore 

 majore. 



9 . Elytris rufo-testaceis, obsolete striatis, densissime rugosis, mar- 

 ginibus vittaque obliqua ab humero fere ad apicem decurrente nigris; 

 tibiis anticis bidentatis, tarsorum anticorum unguiculi divisione 

 superiore majore. 



Hah. N. India : Punjab, Himalayas. 



This species is similar in form and marking to A. vari' 

 color, Gyllenh., but is very distinct by the sexual differ- 

 ences referred to. The female bore the unpublished name 

 of A. rugosa in Reiche's collection. Burmeister has very 

 briefly described a species, A. rujica2nlla, from the same 

 locality, which resembles the female oi A. oncgosa, but the 

 description applies, according to the authoi', to both sexes. 

 In his species, moreover, the front tibia is three-toothed, 

 and the sculpture of the elytra differs from that of A. 

 rugosa. 



Another new species differs from those preceding in the 

 fact that the sexes exhibit an entire difference in the 

 colour itself and not merely in its distribution. In the 

 male the colour is a rich deep purple and in the female a 

 rather dark metallic green. Even in immature specimens 

 in which the colour is undeveloped the sexes may be 

 readily distinguished by a slight reddish or greenish lustre. 



A. imperialis, sp. n. 



Oblongo-ovata, subdepressa, peneo-testacea ; capite punctato-rngoso, 

 clypeo semicirculariter arcuato ; protliorace pallide marginato, crebre 

 pimctato, profunde longitudinaliter sulcato, lateribus angulato arcu- 

 ato, angulis posticis obtusis ; scutello testaceo, punctato ; elytris 

 coatatis, subtiliter punctatis ; pedibus longissimis. Long. 16 mm. 



(J . Capite, protlioracis disco elytrisque purpureis ; pygidio testaceo, 

 tumido, strigato-punctato, apice obtuso. 



9 . Fronte, prothoracis disco elytris pygidioque viridibus ; protlio- 

 race latiore ; pygidio subplano, subtiliter rugose, acuminato. 



Hah. North China {Fortune). 



This species is allied to A. aulax, Wied., which it 

 resembles in size, form and sculpture, but it is rather more 

 depressed and less densely punctured. The furrow on the 

 thorax is broader and the elytral costal rounded. Tlie 



