PYROPHOKUS. 469 



the antennae and legs brown. Head thickly, coarsely punctate, deeply triangularly depressed in front, 

 the eyes large ; antenna? strongly serrate, stout, and extending two joints beyond the hind angles of the 

 prothorax in the male, less dilated and a little shorter in the female, the third joint twice the length of 

 the second and about one-half the length of the fourth joint. Prothorax considerably longer than broad, 

 flattened on either side of the middle of the disc ; the sides feebly rounded and gradually converging in 

 front and almost parallel behind ; the hind angles long and strongly divergent, rather stout, finely 

 carinate ; the surface densely, finely punctate, the punctuation much more diffuse on the middle of the 

 disc, down the centre of which are traces of a smooth, slightly impressed median line ; the base with a 

 rather prominent transversely compressed tubercle in the centre. Elytra about two and three-fourths 

 longer than the prothorax, somewhat rapidly narrowing from a little below the base in both sexes ; finely 

 punctate-striate, the interstices flat and densely, rugulosely punctate ; the apices distinctly dehiscent and 

 strongly acuminate. Beneath closely and finely, the prosternum coarsely and sparsely, punctate ; meso- 

 sternum with the sides of the cavity considerably raised, subhorizontal behind, almost vertical in front. 

 Length 23i-25|, breadth 6|-7 millim. ( J $ .) 



Hab. Costa Rica (Van Patten). 



One pair. Allied to P. lychniferus, Germ., and P. havaniensis, Cast. ( = causticus, 

 Germ.), differing from the first-mentioned in the longer and more parallel thorax in 

 the male, and from the latter in the smaller vesicles and the stouter and less abruptly- 

 divergent hind angles of the thorax ; also from both of these species in the form 

 of the genitalia of the male. In the form of the mesosternum it agrees with 

 P. lychniferus. 



9. PyrophoniS havaniensis. (Tab. XX. fig. 26, genitalia, d .) 



? . Pyrophorus havaniensis, Cast. Hist. Nat. Ins., Col. i. p. 236 (1840) l ; Cand. Cat. Method. 



Elat. p. 159 \ 

 Pyrophorus causticus, Germ. Zeitschr. fiir Ent. iii. p. 36 (1841) 3 ; Cand. Monogr. Elat. iv. p. 28*. 



Hab. Mexico (Salle).— Cuba 1234 . 



In the Salle collection there is a male example of this species labelled " Mexico," 

 but the locality requires confirmation. This insect agrees perfectly with numerous 

 others from Cuba in the Janson collection, and it has the genitalia of the male 

 similarly formed. 



10. Pyrophorus ornamentum. (Tab. XX. fig. 27, genitalia, <s .) 



Pyrophorus ornamentum, Germ. Zeitschr. fiir Ent. iii. p. 39 1 ; Cand. Monogr. Elat. iv. p. 34 2 . 

 <§ . Pyrophorus gemmiferus, Germ. loc. cit. p. 26 3 . 



Hab. Mexico 1 - 3 , Ciudad in Durango (Forrer), Puebla (Salle), Cuernavaca in 

 Morelos (Salle, Hbge), Yautepec in Morelos, Iguala in Guerrero (Hoge), Puente de 

 Ixtla and Mescala in Guerrero (H. H. Smith). 



I have seen thirty-five specimens of this species, which may be known from most of 

 its allies by the prominent, oblong, laterally compressed elevation at the base of the 

 thorax in the middle, and also by the peculiar form of the genitalia of the males. The 

 vesicles on the thorax are large and distinctly raised in most of our specimens ; they 



