PYEOPHOEUS. 471 



the basal third in both sexes ; finely or somewhat coarsely punctate-striate, the interstices flat or feebly 

 convex, and densely, rugulosely punctate ; the apices conjointly rounded, with the sutural angles sharp or 

 very feebly mucronate. Beneath closely and finely, the prosternum coarsely and sparsely, punctate ; 

 mesosternum with the sides of the cavity feebly raised. 

 Length 16|-23, breadth 5-6| inillim. ( tf $ .) 



Hab. Mexico, Vera Cruz, Cosamaloapam, Chiapas {Salle), Temax in North Yucatan 



(Gaumer). 



Fifteen examples, eight of which are from Yucatan ; some of those in the Salle and 

 Janson collections were mixed with the series of P. ornamentum and P. stella. From 

 P. stella and its allies it may be recognized by the form of the thoracic tubercle ; and 

 from P. ornamentum by the laterally compressed thoracic tubercle being considerably 

 smaller, the antennae more elongate and less dilated, and the genitalia very differently 

 formed, in the males. The females are not easy to separate. P. mexicanus also differs 

 from typical P. ornamentum in the smaller and less prominent thoracic vesicles. 

 P. physoderus is another closely allied form, but that insect has much shorter and 

 stouter antennae in the males, and a small subconical tubercle at the base of the 

 thorax ; the genitalia of the males, however, are very similar. 



13. PyrophorilS physoderus. (Tab. XX. fig. 30, genitalia, 6 .) 



Pyrophorus physoderus, Germ. Zeitschr. fur Eat. iii. p.36 1 ; Lee. Trans. Am. Phil. Soc. new ser. x. 

 p. 492 2 ; Cand. Monogr. Elat. iv. p. 33 3 . 

 Hab. North America, Southern United States 3 , Alabama 1 , Louisiana 2 , Texas. — 

 Mexico 3 , Monclova in Coahuila (Dr. Palmer). 



Two males from Coahuila and a female labelled " Mexico " in the Janson collection 

 are all I have seen of this species from within our limits. In this insect the antennae 

 extend very little beyond the hind angles of the thorax in the males, and are still 

 shorter in the females, and the thorax in the females is very convex. The thorax has a 

 small tubercle in the middle at the base. P. physoderus is the only species of the 

 genus extending north of our boundary. 



14. Pyrophorus Stella. (Tab. XX. figg. 32, genitalia, 6; 32 a, base of 



abdomen.) 



Pyrophorus stella, Cand. Monogr. Elat. iv. p. 32, t. 1. fig. 7 '. 



Pyrophorus caliginosus, Sturm, Cat. p. 67 (1843) 2 . 



Hab. Mexico l 2 (Salle, ex coll. Sturm), Tuxtla (Salle), Misantla, Jalapa (Hoge), S.m 

 Francisco in Vera Cruz (ex Wickham). 



Two species appear to have been confused under this name by Dr. Candeze — one 

 with the antennae extending a little beyond the hind angles of the thorax in the male, 

 the other with the antennae considerably more elongate in this sex. The first-mentioned 

 answers to his description; the second is described below under the name radians. 



