MACKODACTYLUS. 139 



3. Macrodactylus mexicanus. (Tab. VIII. fig. 17.) 



Macrodactylus mexicanus, Burm. Handb. der Ent. iv. 2, p. 58 (pars) \ 



Macro dactylus angustatus, Casteln. Hist. Nat. Ins. Col. ii. p. 147 2 (nee Latr. ; nee Pal. de 



Beanv.) . 

 ? Macrodactylus cinereus, Blanch. Cat. Coll. Ent. i. p. 90. 



Hab. Mexico 1 2 , Duraznal, Etla, Puebla, Oaxaca (Salle), Jalapa [Edge), Toluca (Salle, 

 Hbge), Mexico city (Dr. Palmer, Flohr, Hbge), Alvarez Mountains (Dr. Palmer). 



Var. vel aberratio $ • Thoracis pilis medio densissimis, erectis, infuscatis. 



Hab. Mexico, Guanajuato (Salle), Mexico city (Hbge). 



Burmeister seems to have regarded this and the preceding (M. variipes) as one 

 species; at least his description applies to both. Castelnau's brief description of 

 M. angustatus applies well to M. mexicanus; and M. cinereus, Blanch., might be taken 

 to be the same species, were it not for the locality, Peru. 



There is nothing in general form or structure to distinguish M. mexicanus from 

 M. variipes and M. uniformis. It differs, however, in never being of a uniform pale ashy 

 colour above, in the integument (especially of the thorax) being steely-blue, and in the 

 laid pubescence being finer and sparser. A general bluish-grey tint prevails over the 

 surface, varied by a tawny area at the base and shoulders of the elytra. The striae of 

 the latter are generally left bare of pubescence ; but they are sometimes covered ; the 

 suture and the outer margin are nearly always blackish. The thorax has a distinct 

 dorsal furrow. The anterior tarsi and the antennal club are black ; the four posterior 

 tarsi are rather darker than in M. uniformis — black, with the bases of the joints reddish, 

 and ringed with cinereous hairs. 



4. Macrodactylus infuscatus. 



M. rnexicano valde affinis, sed differt elytris furvescenti-fuscis, pilis recumbentibus subtilioribus brevioribusque 

 sequaliter vestitis, striis nullo modo denudatis prosternique spina postcoxali apice late obtusa. Clypeo 

 parum elongato et angustato, apice leviter sinuato ; tborace viridescente, pilis densis cinereis vestito, dorso 

 canaliculate ; tarsis anticis nigris ; tarsis 4 posticis (cum apicibus tibiarum) nigris, basi plus minusve rufis, 

 cinereo- pilosis. 



Long. 10-11 millim. 



Hab. Mexico, Parada, Etla, Juquila, Oaxaca (Salle), Mexico city (Flohr). 



Var. M. vieinus (Deyrolle, MS.). Elytrorum striis 2 et 3, 4 et 5, 6 et 7 plus minusve approximatis inter- 

 stitiisque 3° et 5° convexis. 



Hab. Mexico, Cuernavaca, Capulalpam, Parada,, Juquila (Salle). 



I have adopted the name given to one of the above-described forms by Sturm, 

 according to the Salle collection. The elytra tend to become dusky towards the apex and 

 margins. The metasternum and the ventral segments in the male are armed with spiny 



TT 2 



