LACHNO STERNA. 195 



sed basi oblique triangulariter grosse dentato nee quadrato. Antennarum clava pentaphylla, articulo 6° 

 sat abbreviato, 7° parvo et tenui, 8°-10 m sequalibus. 

 Long. 14 millim. 



Hah. Mexico (coll. Bates). One male example only. 



The first joint of the 5-jointed antennal club is one third shorter than joints 8-10, 

 and the second is only one sixth the length of those joints. The similarity between this 

 species and the preceding is so great that I should have been inclined to consider the 

 change in the proportionate lengths of the leaflets of the antennal club as due to 

 variation or aberration, had it not been for the different form and clothing of the 

 pygidium and the shape of the clypeus. 



III. Claws broadly cleft ; lase moderately dilated ; lower tooth very broad and strongly 

 curved, and denticulated on its lower edge. 



22. Lachnosterna testaceipennis. (Tab. XL fig. 6, s .) 



Ancylonycha testaceipennis, Blanch. Cat. Coll. Ent. i. p. 134 \ 



Hah. Mexico 1 , Puebla, Cordova, Toxpam, Tlatingo, Orizaba, Juquila (Salle), 

 Las Vigas, Jalapa, Tula (Hbge), Oaxaca (Salle, Edge) ; Guatemala (Salle), Coban 

 (Champion) ; Costa Rica (Bogers). 



Many examples in the Salle collection under the above name agree with Blanchard's 

 description of this insect. It can be best distinguished from the other numerous pale 

 or reddish-testaceous species of medium size (15-18 millim.) by the structural peculi- 

 arities of the sexes, which are as follows : — 



cf . Pygidium convexum, nudum, grosse sed haud profunde rugoso-punctatum. Yenter medio anguste 

 depressus, nudus, politus, segmento 4° apice medio et 5° toto medio dense aspere rugulosis, 6° late 

 transversim depresso, grossius rugoso-punctato, interdum medio canaliculate. Calcaria postica libera, 

 sed minus elongata laminato-compressa. Ungues dente inferiore multo breviore et latiore, apice truncato 

 subbamato margineque inferiore plus minusve denticulato ; basi usque ad dentem aequaliter dilatata. 

 Antennarum clava elongata. 



5 . Pygidium paullo elongatum, rugoso-punctatum, breviter setosum, margine apicali medio verticaliter 

 plicato et fasciculato-setoso. Venter medio politus, interdum canaliculars, segmento 5° postice et 6° 

 (convexo) setifero-punctatis. Calcaria postica brevia et late compressa. Ungues dente inferiore sub- 

 mediano lato sed acuminate, margine inferiore denticulato. 



In most examples of the very numerous series examined the surface is dull, and, the 

 thorax especially, pruinose ; but in others from the same localities the surface is glossy 

 without trace of pruinosity. 



2CC2 



