147 



from slightly below the summit of the arch of a lateral con- 

 vexity, so that the outline is seen as a trisinuate curve rather 

 than as three separate and independent lobes. This character 

 (the "division" of the trilobed outline) is not one that can 

 be used with advantage to constitute primary or even second- 

 ary aggregates in a tabulation, owing to the numerous species 

 in which the outline might be considered intermediate between 

 the two forms; but in some instances where an already small 

 aggregate requires subdivision, and there happen to be no 

 species among them with the trilobed outline of intermediate 

 form, it is of value for tabulation. I find this character to 

 be remarkably constant and reliable within specific limits. 



This Group contains fewer known species than any other, 

 only five being attributable to it (of which two are now 

 described as new). The two that I have placed at the begin- 

 ning are closely allied inter se, the others all isolated forms 

 resembling the rest and each other in little more than the 

 structural characters that assign them to the Group. The 

 following table differentiates the known species : — 



A. Middle lobe of trilobed outline of head 

 not or scarcely more than half each 

 lateral lobe. 

 B. Pronotum more closely punctulate capillatus, Macl. 



BB. Pronotum less closely punctulate placidus, Blackb. 

 A A. Middle lobe of trilobed outline much 

 more than half each lateral lobe. 

 B. Elytra not set with long erect hairs zalotus, Blackb. 

 BB. Elytra set with long erect hairs 

 C. Elytra opaque, granulate, scarcely 



visibly punctulate Lindi, Blackb. 



CC. Elytra nitid, coarsely rugulosely 



punctulate maculatus, Blackb. 



II. placidus y sp. nov. Modice elongatus, postice leviter dila- 

 tatus ; minus nitidus ; castaneus : supra pilis brevibus 

 adpressis et nonnullis erectis minus crebre vestitus ; clypeo 

 (hoc antice late leviter emarginato) fronteque crebre 

 rugulosis, planum fere continuum formantibus ; labro 

 clypei planum vix attingenti; capite antice (a tergo 

 oblique viso) tripliciter convexo, parte mediana quam 

 laterales fere duplo angustiori ; antennis 8-articulatis ; 

 prothorace quam longiori ut 19 ad 11 latiori, antice sat 

 angustato, supra subfortiter minus crebre punctulato 

 (puncturis circiter 17 in segmenti longitudine), lateribus 

 (superne visis) sat arcuatis, angulis anticis sat acutis sat 

 productis posticis (superne visis) sat rectis, basi bisinuata, 

 margine basali ad latera perspicue magis elevato ; elytris 

 subgranulatis crebre subtiliter squamose punctulatis 

 (trans elytron puncturis circiter 30) ; pygidio sat crebre 

 nee profunde punctulato ; coxis posticis quam metaster- 



