I'.Ms.l F. II. (Ikavkly: I'ds.'.ididni'. vj l/ic World. 43 



Proculus goryi (Melly). 



Passaliis goryi, Melly. 1833, pi. Ivi. 

 Two specimens from Vera Paz, Guatemala, 67-72 mm. in length. 

 Proculus (joryi may readily be distinguished from the other two species before me bv 

 the obsolete upper tooth nf the mandibles, normally flattened mentum, and glossy elvtra. 



Proculus opacipennis (Thomson). 



Passalus ojmoprtitns. 'riuniisoii. 1^57, pp. 120-121, pi. ,xxi, lig. 4. 

 Three specimens from Ecuador and two from lUiatemala, 51-56 mm. in lonfth. 

 Proculus opacipennis has a long and slightly curved upper tooth on each mandible, 



:i normally flattened mentum. and matt eh'tra. 



Proculus mniszechi, Kaup, 1868. 



Piticiiliis miii.surlii. Kiiuj). IiSClS^;. pp. jl-i:;. 



Eight specimens from (Juatemala (mostly from Xera Paz), one from Ecuador, and one 

 from San Pedro Snla, Honduras. They vary from 53-69 mm. in length. 



Proculus mniszechi has an acute and well developed upper tooth on each mandible, glossy 

 elytra, and a mentum with the inner margin of the forwardly directed lateral processes 

 turned almost at right angles to the rest of the plate in a ventral direction to form a ])air 

 of .smoothly rounded lobes. 



Subfamily PASSA/JXAE. 



The subfamily Passalinae as represented in the collection before me includes five 

 clearly defined genera, and a large assemblage of species separated from one another by 

 various combinations and modifications of characters so graded as thoroughly to ob.-^cure 

 their true relationships one to anotluM-. 



In the first three genera the clypeus is always exposed and the antemiae always 

 have three lamellae. The first of them, Chondrocephalus, only differs from the primitive 

 Pseiulacanthine genus Popilius in having no suture between the clypeus and the frons 

 and no hair on the lateral areas of the metasternum. C. quinquecornutus is to some 

 e.xtent tran.Mtional between the two genera, having definite traces of the suture : but as 

 the.se are not very distinct and as the lateral areas of the metasternum are hairless it 

 seems to me to make, on the whole, a better Chotidroceuiialus than Popilius. 



The second genus. Vindex. contains one species, T'. ognoscendus. in which the 

 dypeo-frontal suture is distinct throughout as in the Pseudacanthinae : and but for its 

 flattened form and separate elytra with hairless sides this species might have been held to 

 indicate the relationship of its genus to Proculejus instead of to Chondrocephalus ; for 

 Vindex po.sse.sses the main peculiarities of the dentition characteristic of Pr,u<il,hif: 

 (.see above, p. 10). 



One species of Vindex. described below fur the fir.st time, has the elytra united as 

 they are in the next genus Proculejoides. But whereas this .species retains the flattened 

 form characteristic of other species of Vindex. Prin-ulejoides has assumed the more ma.^^sive 

 form ordiiinrily assumed by tiightless species of all groups. 



o2 



