192 LAMELLICORNI A . 



correctly) in the Salle collection, the species offers well-marked distinctive characters in 

 both sexes. 



cS . Pygidium medioeriter convexum, disperse punctatum. Venter medio depressus segmentisque 2°-5 m densis- 

 sime erecte pilosis, 5° margine postico medio recte truncate Calcaria postica sat gracilia, libera. Ungues 

 basi bidentati, dente inferiore recta ad den tern magnum basalem approximate ; ungues intermedii dispares, 

 exteriore majore, abruptius curvato et extus lobato. 



$ . Pygidium planum, triangulare, apice paullo simpliciter convexo (" pygidio conico," Blancb.), disperse 

 punctatum, nudum. Venter breviter sat sparse setosus, politus. Ungues basi dente magno sed dente 

 normali inferiore magis distante, longiore et acutiore. 



The claws are remarkable for the large and more or less quadrangular dilatation of 

 their base, in both sexes. In the male they are further distinguished by the ordinary 

 tooth lying nearer the base and being separated from the dilatation only by a narrow 

 cleft, the tooth also being shorter and straighter than usual. In the female the 

 ordinary tooth lies nearer to the middle of the claw, and is separated from the dila- 

 tation by a wide interval. The distorted curvature of the left claw in the middle tarsi 

 is a further curious structure. 



L. ravida resembles almost exactly Phytalus obsoletus in colour and in sexual 

 characters, with the exception of those of the tarsi and claws. 



We figure a male example from Oaxaca. 



16. Lachnosterna dentex. 



L. ravida, affinis, unguibus similibus ; sed differt corpore erecte piloso, etc. Minor, oblongo-ovata, rufo-testacea, 



nitida, erecte pilosa ; antennarum clava pallidior; clypeo concavo, margine antice elevato nee sinuato ; 



tborace disperse punctato ; elytris punctulatis, ecostatis ; pectore fulvo-villoso. 

 d . Pygidium medioeriter convexum, sat dense, apice versus parcius, punctulatuin, erecte pilosum. Venter 



medio depressus, subnitidus, sparsim setosus, segmento 5° apice medio densius aspere setifero-punctato. 



Calcaria postica elongata, libera. Ungues valide tridentati ; intermedii sicut in L. ravida difibrmes, ungue 



exteriore abrupte curvato et extus dente elongato. 

 Long. 16 millim. 



Hal. Mexico, Milpas in Durango (Forrer), Guanajuato (Salle). 



Two examples, both males. 



The claws are toothed similarly to those of L. ravida, but the apex of the claw is not 

 so elongated and distant from the lower tooth, so that the dilated basal and the lower 

 and the upper teeth are nearly equidistant. The bent exterior claw of the middle tarsi 

 has on the outer side a longish projection, which is no other than the median tooth 

 diverted laterally out of its true position ; this tooth is here of moderate length, but 

 longer and sharper than in L. ravida. 



A single example of a Lachnosterna found by Herr Hoge at Ciudad in Durango is 

 possibly the female of this species. 



17. Lachnosterna anomaloides, (Tab. XL fig. 2, 6 .) 



L. ravida} affinis, unguibus similibus; sed differt elytris incumbenti-griseo-pilosis. Elongato-ovata, fulvo- 

 testacea, capite thoraceque runs ; clypeo concavo, margine antico elevato integro ; thorace disperse punc- 



