70 Mr. G. C. Champion's Revision of the Mexican 



in these latter the prothorax is more or less truncate in 

 front (leaving a portion of the head exposed from above) 

 and has a faint oblique notch towards the base, at least 

 in (^, and the second joint of the antennae is small. P. 

 dilaticornis, of which the $ only is known, was placed 

 doubtfully by Gorham as a variety of P. serricornis; it 

 can be included under Photinomorpha for the present. 

 Photurocantharis, Pic,* based upon four or five species 

 from Tropical South America, has the prothorax similarly 

 produced anteriorly ; but it differs from the present genus 

 in having the head subrostrate, and the penultimate tarsal 

 joint so deeply cleft as to appear strongly and narrowly 

 bilobed. These southern insects were supposed by Pic 

 to belong to the Lampyrid-genus Photuris and were sent 

 by him to Olivier as such for determination. 



1. Photinomorpha simulans, n. sp. (Plate III, figs. 5, cJ; 

 6, $, var.) 



Broad, opaque, finely pubescent; black, the prothorax (a large 

 subtriangular or transverse patch on the disc excepted), the base 

 of the mandibles, the explanate margins of the elytra, and the last 

 ventral segment wholly in (^ and at the sides in $, flavous. Antennae 

 stout, serrate, gradually tapering towards the tip, short in $, longer 

 in cj, joint 2 stout, rather more than one-half the length of 3, 3 a 

 little shorter than 4. Prothorax transverse, semicircular, broadly 

 explanate laterally, the margins very feebly sinuate anteriorly and 

 before the base, without trace of notch in (^. Elytra elongate, at 

 the base parallel and narrower than the prothorax, the margins 

 broadly arcuato-explanate from a little below the humeri, the disc 

 obsoletely costulate. ^ $. 



Var. The elytra and abdomen wholly, and sometimes the ex- 

 planate portions of the prothorax also in part or almost entirely, 

 black. ?. 



(^. Eighth ventral segment broad, short, carinate down the 

 middle posteriorly, feebly emarginate and subcrenulate at the 

 apex, the short dorsal portion of the same segment deeply cleft 

 and armed at the apex on each side with two short, curved teeth ; 

 on either side of the partially evaginated internal sac a very long, 

 stout hook is extruded, and the apices of several shorter hooks are 

 also visible beyond the tip of the ninth segment. (Figs. 26, 26a.) 



Length 13-16, breadth 6-7^ mm. (cJ ?.) 



* Melanges exot.-entom., fasc. x, p. 3 (Oct. 1914). 



