Horn. J o4o [June 20, 



slightly arcuate, so that the two approach slightly at middle, and also a 

 broad transverse groove which divides the median convex portion of the 

 prosternum into two unequal portions. The lateral grooves extend also 

 on the meso- and metasternum, and are there divergent, running 

 parallel with the sutures. On the outer side of the grooves, and limit- 

 ing them in their entire length is a ridge more or less acute as the groove 

 is broader, and in P. Sayi, the ridge approaches so closely to the lateral 

 carina of the prosteraum, especially in front that the channel which 

 usually exists between the two ridges is entirely obliterated. In conse- 

 quence of this in sepai-ating our species (Trans. Am. Ent. Soc, 

 1870, p. 142), I described Sayi as having a single sulcus on each side and 

 nitidus and fratemus two on each side. This method of expression is 

 however faulty and may mislead, and should therefore be lost sight of. 



The following table will serve to distinguish our species : 

 Transverse thoi-acic impression usually obliterated, rarely 

 visible at the sides ; meso-metasternal plate sparsely 

 punctured. 



Elytral punctures round, coarse and sparsely placed Barbelini. 



Transverse thoracic impression entire and moderately deep. 



Elytra strigoso-punctate transversus. 



Elytra coarsely punctured, punctures round, not strigose. 

 Body beneath coarsely and rather closely perforato-punc- 



tate Sayi. 



Body beneath very sparsely punctate. 



Transverse sulcus of prosternum scarcely broader than 

 the lateral sulci, posterior division of prosternal 

 carina of moderate extent, the anterior elongate 

 oval. Thorax moderately coarsely but not densely 

 punctured. Laternal sulcus of pronotum entire. 

 Posterior portion of prosternal carina trapezoidal. . consors. 



Posterior portion of prosternal carina triangular fratemus. 



Transverse sulcus of prosternum very broad, wider 

 than the lateral sulci, posterior division of prosternal 

 carina very minute, anterior transverse. Thorax 

 very sparsely and finely punctulate. Lateral sulcus 



of pronotum not attaining the base nitidus. 



P. Barbelini, Mars. Mon., 1862, p. 684; 1861, pi. 4, No. 46, fig. 2; 

 pusillusX, Lee. Bost. Journ. V., p. 80, pi. 6. fig. 8 ; Erichsonii, Lee. 

 List, p. 28. 



Oblong oval, moderately convex, brownish, shining. Head finely and 

 not densely punctured, front slightly concave transversely. Thorax sub- 

 quadrate, slightly broader than long, base not margined, lateral groove 

 deep, not quite attaining the basal margin, marginal space convex, not 

 interrupted ; disc with slight trace of transverse impi-ession at the sides 

 near the anterior third, frequently entirely wanting ; surface sparsely 

 punctured, marginal space more densely and coarsely. Elytra coarsely 



