466 Mr. A. Murray's Monograph of the genus Catops. 



. r Margins of thorax paler than middle angustatus. 



' \ Margins of thorax not paler than middle ... do. var. cisteloides. 



r Base of thorax cut in, so as not to form a continuous 



r I outline with elytra G 



' I Base of thorax forming a continuous outline with 

 I elytra or nearly so 19 



Colour of pubescence grey and brown or dull yellow 

 on thorax, yellowish hairs on base and margins 

 of elytra wanting or scarcely perceptible, and 



6.«^ either no bloom or grey bloom on elytra 7 



I Colour of pubescence clear yellow on thorax, a 

 I brownish-blue or purplish bloom on the elytra, 

 L and yellowish hairs on base and sides of elytra... 14 



{Antennae longish and subfiliform, not heavily 

 clubbed 8 

 Antennae shorter and more clavate 12 



Q J Elytra transversely strigose acicularis. 



* (.Elytra not transversely strigose 9 



Q r Antennae with apex pale picipes. 



' \ Antennae with apex not paler than rest 10 



Q / Posterior angles of thorax acuminate behind 11 



'\ Posterior angles of thorax not acuminate behind... fuscus*. 



f Posterior angles much produced, antennae wholly 



Y I ferruginous meridionalis. 



' I Posterior angles only slightly produced, antennae 

 L more dusky towards apex nigricans. 



2 / Antenn ae very heavily clavate chrysomeloides. 



' \ Antennae only moderately clavate 13 



o r Insect thin and narrow morio. 



* \ Insect shorter and more compact coracinus. 



. /Antennae comparatively long and subclavate nigrita. 



' l Antennae heavily clavate 15 



{Thorax deeply punctured neglectiis. 

 Thorax more or less transversely granulose or 

 wrinkled 16 



^ J Thorax nearly parallel on the sides quadraticoUis. 



' \ Thorax not parallel on the sides 17 



y J Thorax faintly transversely wrinkled 18 



* X Thorax granulose tristis, var. rotundicollis. 



{Thorax short, transverse, and not broad; elytra 

 usually very long tristis (type). 

 Thorax broad, elytra moderate in length ... tristis, var. grandicollis. 



q J Middle tarsi widened in males 20 



* L Middle tarsi not widened in males 25 



* Fuscus is one of those species, which, from their transitional charac- 

 ers, nearly put dichotomy at defiance. It might almost be placed under 

 No. 19 instead of No. 6, as the base of the thorax has only a slight inter- 

 ruption in its continuity ; and again, its brown or purpUsh elytra are not 

 unlikely to induce one to place it under No. 14 instead of No. 7- 



