OG TIIOS. L. CASEY. 



more distant in the rows ; the first joint of the anterior tarsi is much 

 more swollen and is broader than the third joint ; the under surface 

 of the abdomen and the surface of the posterior femora are more 

 thickly pubescent ; the second joint of the antennae is distinctly 

 shorter than the third ; in cenescens, the body, besides being smaller 

 in size, is of a different shape ; in interstitiaJis the elytra are widest 

 at a point one-third their length from the humeri, and the general 

 form is slightly more elongated and less robust. 



TYLODERItlA. 



T. nigrum n. sp. — Form rather robust; body deep black tliroughout, 

 moderately shining, scarcely metallic ; tibiae dark fuscous. Head moderately 

 convex, rather coarsely and feebly punctate, very sparsely so in the middle, 

 more densely at the sides ; rostrum very robust, anterior surface broadly 

 impressed at the base, coarsely and longitudinally rugulose or furrowed, 

 entire surface minutely granulose. Prothorax just perceptibly wider than 

 long; sides just visibly divergent from the basal angles for two-fifths the 

 length anteriorly, then rather suddenly and strongly constricted ; very 

 evenly and strongly arcuate anteriorly when viewed vertically, base very 

 broadly and feebly arcuate ; Hanks perpendicular, strongly swollen just over 

 the anterior coxae, edge sinuate anteriorly, emargiuate for the coxae at the 

 sides : disk of pronotum very sparsely punctate dorsally, where the punc- 

 tures are round, small, impressed, and much finer anteriorly than toward 

 the base ; on the flanks the punctures are very irregularly distributed, much 

 coarser, deeper, and generally closer ; surface minutely granulose, feebly 

 shining. Scutellum longer than wide, convex, angulate behind. Elytra at 

 the humeri slightly more than one-third wider than the contiguous pronotum ; 

 sides parallel and very feebly arcuate for one-half the length, then gradually 

 convergent; disk acutely rounded behind, very convex, scarcely more than 

 one-lialf longer than wide, slightly more than twice as long as the pronotum ; 

 punctures large, deeply impressed, round, arranged in rows, distances of the 

 punctures in the sutural rows much less than in the others : flanks inflexed ; 

 edges not bordered, nearly straight laterally, acute ; viewed from beneath, 

 the edges are very broadly cusped, cusp broadly rounded and placed at the 

 sides of the third ventral segment. Under surface of abdomen sparsely 

 punctate, slightly more densely so on the last segment, first two segments 

 together slightly longer than the last three ; metasternum very coarsely, 

 deeply, and rather sparsely punctate, very coarsely granulose. Length 

 3.8 mm. 



^Northern Illinois. 



This species diHers from cereinn and baridnm in facies. One of 

 the numerous structural differences is shown in tigs. 10, 11, and 12, 

 plate I., which represent the relations existing between the meso- 

 sternal and metasternal episterna, and the mesosternal epimeron in 

 the three species respectively. It is seen that, while the mesosternal 



