64 LAMELLICOENIA. 



species, with rare examples coppery. In our very large series from Costa Rica nearly 

 all the examples are rich golden-coppery, rarely with a greenish tinge. 

 A fully-developed male from Costa Eica is figured. 



26. PhanaeilS mexicailUS. (Tab. IV. figg. 18, <? ; 18 a, side view of head and 

 thorax.) 



Phanaus mexicanus, Harold, Ann. Soc. Ent. Fr. 1863, p. 171 1 . 

 Phanceus divisus, Harold, loc. cit. p. 171 2 . 



Sab. Mexico, Sonora {coll. Bates), Pinos Altos in Chihuahua {Buchan- Hepburn), 

 Presidio (Forrer), Puebla, Orizaba, Tuxtla, Vera Cruz 1 , Izucar, Juquila, Oaxaca 2 {Salle), 

 Villa Lerdo in Durango, Tacambaro, Jalapa, Misantla, Oaxaca {Edge). 



Von Harold separated P. divisus on the ground of a slight difference of relative 

 position in the tubercles on the sloping disc of the thorax ; the tubercles exist in the 

 complete number of three only in males of the greatest development, and the difference 

 between P. mexicanus and P. divisus lies in the anterior tubercle being in the former 

 more or less close to the two hinder ones, and in the latter distant from them. On 

 comparing, however, a large number of well-developed males, it is at once seen that all 

 grades in the relative distance of the tubercles are exhibited, and that the division 

 into two species must be quite arbitrary. Besides, individuals thus compared show no 

 difference in other respects when they differ in the position of the tubercles. In males 

 of secondary development the anterior tubercle disappears ; in others of still lower 

 grade all three are wanting. 



The species varies very greatly in its rich metallic colours. The brightest form, of 

 resplendent golden-coppery hues, is chiefly found in Southern Mexico. A beautiful 

 dark blue variety occurs at Izucar. The female also varies greatly in size, colours, and 

 in the form and degree of prominence of the thoracic carina ; it is, however, always 

 distinguishable from the same sex of P. sailed by the carina not being sharply tuber- 

 culated in the middle, nor followed by a concavity. From the females of P. wagneri 

 and P. amithaon it may be generally distinguished by the absence of punctiform' 

 impressions ; but, as already observed, in some females (as well as males) of P. wagneri 

 these small punctiform impressions are wanting. This indication being absent, I see 

 no other means of separating the females of these three closely-allied species. 



A fully-developed male from Puebla is figured. 



27. PhaxiaeilS SCintillanS. (Tab. IV. figg. 19, d; 19 a, side view of head and 

 thorax.) 



P. mexicano affinis, sed thorace <$ sicut in P. amithaonte, disco antice declivi piano scabroso, medio prope mar- 

 ginem anteriorem tuberculo acuto et ante tuberculum bituberculato, angulis elevatis (posticis paullo minus 

 quam in P. amithaonte approximatis), apice antice porrectis. Leetissime aurato-cupreus, splendidissimus ; 

 tborace medio basi impunctato ; elytris striis acute insculptis, interstitiis parum convexis lsevissimis. 



