304 H. W. BATES 



rotundatus, convexus, margine laterali anguste explanato (inter- 

 dum pallido) angulis anticis valde declivibus rotundatis, posticis 

 in dentem sat elongatum acutum prolongatis, post dentem mar- 

 gine profunde exciso ante dentem parum sinuato ; supra grosse 

 et crebre punctatus, punctis transversim subconfluentibus, linea 

 dorsali medio tantum impressa, lineis transversalibus nullis. 

 Elytra convexa, acute punctulato-striata, interstitiis subconvexis 

 crebre discrete punctulatis, maculis utrinque duabus flavis, l.""* 

 subhumerali a stria 4.** usque ad epipleuram extensa extusque 

 dilatata, 2."''^ transversa inter strias 3/™-8/*"". — Long. 7 Yg mill. 



Bhamò; Palon (Pegu); Shwegoo. 



Closely allied to P. Messii (Bates) from Quang-tung, China 

 and probably not more than a local race of that species. It 

 differs, however, constantly in the much larger anterior yellow 

 spot of the elytra, and in the rather more broadly rounded thorax. 

 It also resembles P. 4-gutta.tus (Putz.) from Darjiling, which, 

 however, according to the description, differs in such important 

 characters as the " yeux fort peu saillants " " corselet plus al- 

 longe " (que P. Messii) " plus étroit, moins arrondi sur les 

 cótés " and " ponctuation des intervalles beaucoup plus grosse 

 et confluente. " P. Messii must be very nearly allied to Pristo- 

 machaerus chalcocephalus (Wiedm., Zool. Mag. II, 1, p. 57 (Pa- 

 nagaeus) from Java, differing, in fact, chiefly in the shape of 

 the elytral spots. The yellow marks on the apical margins of 

 the elytra, mentioned by Wiedmann, are not a constant cha- 

 racter, as they exist in some examples of all three species and 

 not in others. To the characters of Prislomachaerus given in 

 Trans. Ent. Soc. 1873, p. 323, I may add that the head pos- 

 sesses only one supraorbital seta, the penultimate joint of the 

 labial palpi is elongate and plurisetose and the soles of three 

 dilated joints of the anterior c/' tarsi are brush-like, without 

 trace of squamulae, the joints being dilated and ciliated on their 

 inner edges. These characters which are also those of Callistus, 

 point unmistakeably to an affinity with the Chlaenii from which 

 it is only the absence of subapical notch and plica from the 

 the elytra that separates them. The extraordinary length and 



