Atomaria.'} clavicornia. 337 



B. Size smaller; thorax very transverse; punc- 

 tuation and pubescence close A. puscata, Sch. 



ii. Anterior nngles of thorax not prominent. 



1. Thorax moderately transverse, very convex ; 

 upper surface, as a rule, entirely deep black, 



with at most apex of elytra obscurely lighter . A. atea, Serbst. 



2. Thorax strongly transverse; upper surface vari- 



able in colour, but never entirely deep black. 



A. Length not exceeding 1 mm. ; colour very 



variable, but with thorax usually testaceous . A. pusilla, PayJc. 



B. Length exceeding 1 mm. 



a. Colour nearly always testaceous ; thorax 



rarely darker than elytra, 

 a*. Punctuation finer; form narrower and 



less convex A. atricapilla, Sieph. 



b*. Punctuation deeper ; form broader and 



more convex A. berolinensis, Kr. 



b. Elytra with base dark and apex more or 

 less broadly testaceous, the colour not being 

 sharply defined : punctuation of thorax very 



close, coarser and deeper, 

 a*. Thorax black ; form more oblong; an- 



tennaj longer A. basalis, Er. 



h*. Thorax red ; form more ovate and 



wider; antennae shorter A. ehenana, Kr. 



C. Elytra with basal half dark and apical half 

 yellowish-testaceous, the colour being very 

 sharply defined; punctuation of thorax close 



but less deep A. MKSOMELAS, Serhsi. 



D. Elytra black with a large common light spot 

 reaching across middle of elytra ; punctuation 



of thorax not so close A. gutta, Steph. 



II. Thorax bisinuate at base. 



i. Size larger, very convex ; upper surface entirely 



black A. GiBBTTLA, Er. (Hislopi, 



Woll.) 

 ii. Size smaller ; apex of elytra reddish or brownish- 

 red. 



1. Form convex, evidently narrowed in front and 



behind A. apicalis, Er. 



2. Form oblong-oval. 



A. Colour dark with apex of elytra lighter. 



a. Size larger ; upper surface more distinctly 



punctured A. analts, Er. 



b. Size smaller ; upper surface less distinctly 



punctured A. btjficornis, Marsh. 



B. Colour rufo-piceous or brownish-red with 



shoulders and apical region of elytra more or 



less broadly and clearly rufesceut .... A. tebsicoloe, Er. 



g. 



A. nigripennis, Payk. Subovate, very scantily pubescent^ shiniii^, 

 head and thorax bright red, elytra black ; antennae moderately long and 

 stout^ red; thorax not very strongly transverse with sides almost 

 angularly rounded in middle, narrowed in front^ anterior angles very 

 acute and prominent, sparingly and very finely punctured, basal truus- 



VOL. III. Z 



