MECAS,—PANNYCHIS. . 205 
8. Mecas rotundicollis. 
Dylobolus rotundicollis, Thomson, Physis, ii. p. 196. . 
Hab. Mexico, Cordova, Panistlahuca (Sallé), Misantla (Hodge); GuaTeMaLa, San 
Joaquin, Guatemala city (Champion). | 
Both sexes have the Lampyris-like pale lateral patches of the three terminal seg- 
ments of the abdomen.. The pale rufous suture and margins of the elytra seem to 
form also a constant character. The apex of the elytra is still more obliquely and 
sharply truncated from the sutural angle. Four examples taken by M. Hoge at 
Misantla are perfectly uniform. 
9, Mecas ruficollis. 
Mecas ruficollis, Horn, Trans. Am. Ent. Soc. vii. p. 44 (1878) ’. 
Hab. Nort America, Texas!.—Mexico (Horn). 
A species, judging from the description, intermediate between UW. laticeps and UM. 
rotundicollis, 
PANNYCHIS. 
Pannychis, Thomson, Syst. Ceramb. p. 127. 
A genus very closely allied to Mecas, but with a difference of habit, due chiefly to 
its broader and more depressed form of body and different coloration. Its chief struc- 
tural character is furnished by the vertical epipleure of the elytra, which are sharply 
defined from the dorsal surface, except towards the apex, where the sides are somewhat 
dilated. In some species the dorsal surface of the elytra is ribbed. Thomson described 
two species from Mexico. If I have determined the second one (P. melanophiloides) 
correctly, it does not belong to the genus, but to Alampyris, described further on. 
1. Pannychis sericeus. 
Pannychis sericeus, Thomson, Syst. Ceramb. p. 197°. 
Hab. Mexico}, Orizaba, Cordova (Sallé). 
2. Pannychis ducalis. | 
Valde elongatus, postice paullo dilatatus, supra depressus, opacus, subtiliter pubescens, niger, capite, thorace 
elytrorumque fascia lata mediana fulvis; capite fascia inter antennis vittisque tribus posticis nigris, post 
-oculos dilatato; thorace medio utrinque fortiter rotundato-dilatato, vittis tribus nigris; elytris apice 
singulatim rotundatis, subtiliter punctulatis, utrinque lineis duabus indistincte levibus; prosterno et 
mesosterno medio, femoribus anticis toto, intermediis et posticis dimidio basali fulvo-rufis; ¢ segmentum 
apicale ventrale medio fovea rotunda profunda. 
9? Colores ut in ¢. Differt elytris dorso utrinque bicostatis, fascia frontali interrupta, thoracis tubere 
laterali dense aureo-piloso. 
Long. 8-9 lin. © 
Hab. Mexico, ¢ Orizaba (Sallé); 9 coll. Bates (ex coll. A. Turner). 
