148 GEO.H. HORN. M. D. 



LAMPYRID.^. 



ZARHiriS Lee. 



In addition to the characters given by Dr. LeConte (Trans. Am. Ent. 

 Soc. ix, p. 39) for the diflferentiation of the species there are some dif- 

 ferences in the form of the maxillary palpi which seem important. 



Z. iiitegripeniiis Lee. — First joint of maxillary palpi longer than either 

 of the others, but not as long as tne two following together Last joint very little 

 longer than the preceding and slightly broader at tip. Palpi entirely yellow. 



Z. ruficollis Lee. — Palpi as in integripeiDiis, the last joint pieeous. 



Z. piciveiitris Lee. — Palpi entirely pieeous. the last joint wider at tip and 

 obliquely truneate. 



Z. Riversi n. sp. —Head pieeous, middle of front and the clypeus reddish 

 yellow. Antennae Diceous, about one-third the length of the body, basal joint 

 jiale. Palpi testaceous, last joint pieeous, triangular, obliquely truncate and 

 shorter than the preceding joint. Thorax transverse, reddish yellow, finely 

 sparsely punctulate, margin broad, equal at apex and base. Scutellum yellow. 

 Elytra black, scabrous, vaguely obliquely bi-costate. Abdomen moderately densely 

 punctate, pale reddish yellow, last segment pieeous. Body beneath entirely pale 

 reddish yellow except the last ventral segment. Length .56 inch ; 14 mm. 

 One specimen S sent me by Mr. J. J. Rivers, from Berkeley, Gala. 

 The superficial characters separating these species seem very constant, 

 and may be tabulated as follows : 



Head entirely yellow. 



Body beneath, abdomen and legs yellow iiiteg:ripeiiiiis. 



Head in great part pieeous. 



Beneath entirely yellow except the last ventral segment Riversi. 



Metasternum and last ventral segment pieeous. abdomen otherwise yellow. 



ruficollis. 



Metasternum and entire abdomen piceoris, nearly black piciventri^i. 



In Phengodes there are no marked palpar differences except that in 

 fusciceps and Sallei these organs are shorter as Dr. LeConte observed 

 to be the case with the antennae. 



L,Y<JUS Fab. 



li. Ferusftiidezi Duges, La Xaturaleza, iv, p. 175, PI. (5, figs. 5, 6; Gorham, 

 Biol. Cent. Am. iii, pt. 2, p. 2. 



This species occurs in Texas and Arizona. Its style of coloration is 

 very similar to cruentus, but the black tip of the elytra is relatively 

 smaller, and is distinctly notched where the humeral costa enters it. In 

 form the present species is very much more expanded behind the humeri, 

 and is of larger size. 



