MACBODACTYLTJS. 145 



20. Macrodactylus rufescens. (Tab. ix. fig. 4.) 



Augustus, viridi-schistaceus, subtus pygidioque nigro-ameus, elytris fulvo-rufis, glabris vel vix perspicue bre- 

 vissime pilosis, antennis pedibusque rufis, illis clava nigra, tarsis nigris, articulis basi cinereo-setosis 

 interdum dimidio basali rufis ; clypeo sat brevi, angustato, apice sinuato-truncato ; thorace angustato, 

 ante medium angulatim dilatato, lateribus post angulum valde sinuatis; elytris interstitiis convexis, 

 alternis interdum altioribus. 



c? . Thorax denudatus vel brevissime recumbente cinereo-pilosus. Prosterni spina postcoxali sat valida, apice 

 angusto obtuso ; ventre biseriatim multi-setoso, spinis elongatis, fulvis, utrinque 5-7 metasternoque 

 dense setosis. 



$ . Thorax densissime et brevissime erecte cinereo-pilosus ; metasternum et venter medio dense suberecte 

 longe pilosa. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer), Yolotepec (Salle), Las Vigas 

 (Edge) ; Guatemala (Salle), Quiche Mountains (Champion). 



Var. 2 • Corpus supra et subtus pedesque dense erecte pilosa setis longioribus intermixtis. 



Hab. Mexico, Yolotepec (Salle). 



Var. $ . Thorax multo longius pilosus elytraque dense subtiliter recumbenti-pubescentia. 

 Long. 8^-14 millim. 



Hab. Guatemala, Quiche Mountains (Champion). 



Similar in colour to M. costulatus var. rufipennis ; but distinguished from it by the 

 much more numerous and longer spiny bristles on each side of the ventral segments, 

 and by the cinereous rings of the hind tarsi. In the numerous male ventral spines, the 

 ashy-ringed hinder tarsi, and the rather short trapezoidal clypeus, the species betrays 

 an affinity to M. variipes and its allies. 



The small examples are from North Mexico (Durango). In Guatemalan male examples 

 he elytra are silky fuscous at the apex. We figure a specimen from Las Vigas. 



21. Macrodactylus longicollis. 



Melolontha longicollis, Latr. in Humb. & Bonpl. Obs. Zool. i. p. 203, t. 22. f. 2 1 . 



S . Prosterni spina postcoxali brevi, valde curvata, apice obtuso ; ventre setis utrinque 4 nigris, rigidis, elongatis ; 



metasterno longe setoso. 

 $ . Venter recumbente cinereo-pilosus, ano longe setoso. 

 Long. 13 millim. 



Hab. Mexico, Acapulco \ Sacatepec, Oaxaca (Salle). 



In this insect the sides of the thorax are clothed with recumbent ashy pile ; the dark 

 blue elytra in the males being glabrous or nearly so, but they are sometimes clothed 

 like the sides of the thorax. The ashy-ringed hind tarsi and the numerous spiny ventral 

 setae point to an affinity with M. variipes and its allies. 



According to the Salle collection, this species is the M. nigroeyaneus, Deyr. M.S., of 

 Gemm. & Har. Cat. iv. p. 1148. 



biol. CEtfTK.-AMER., Coleopt., Vol. II. Pt. 2, December 1887. UU 



