6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



The tenth interval on the deflexed side of the ely^tral disk is invisi- 

 ble from above, slightly costate, joins the epipleural margin just 

 behind the humeri and posteriorly attains the outer part of the apical 

 tumescence. The epipleural margin attains the humeral angle and 

 elytral apex; the submarginal line of punctures is quite entire. 



On account of lacerta Motschulsky being the type of the genus it 

 has been described in detail. This is necessary to differentiate three 

 other phases that are considered to have racial characteristics. 



USECHUS LACERTA HORNI, new variety 



Plate 1, figures 2, 6 



The variety horni differs from lacerta Motschulsky in its smaller 

 size and feebly convex alternate elytral intervals. The elytral tuber- 

 cles are entirely obsolete or feebly developed. The seventh elytra 

 costa (fig. 1,B) joins the fifth at about apical third of costa and 

 the sixth interval is obsolete anterior to the union; eighth interval 

 obsolete between the two rows of serial punctures internal to the 

 costate ninth interval, the latter not in the least tuberculate at sides 

 of the apical declivity, although in some specimens an incipient 

 tubercle may be present. Anterior coxal cavities more or less open 

 posteriorly. 



The antennal club is narrower, joints 10 and 9 quite equal, eleventh 

 more rounded and scarcely longer than wide. 



Measurements. — Length (type) 3.8 mm.; width 1.25 mm. 



Type locality. — California (Duncan Mills on the Russian River, 

 Sonoma County). Collected on July 16, 1908, by the writer. A 

 small series studied. Type a male in the author's collection. Para- 

 types in the United States National Museum and California 

 Academy of Sciences collections. 



Paratypes. — Cat. No. 40378. U.S.N.M., from Santa Cruz Mountains, 

 Cahf. (Koebele). 



USECHUS LACERTA SANTACLARAE, new yariety 



Plate 1, figure 7 



Form rather more robust than lacerta Motschulsky less parallel 

 and less roughly sculptured. Color castaneous to nigro-piceous. 

 Antennae less heavy, club more abruptly formed and there is a 

 greater and more noticeable difference between the width of the 

 eighth and ninth joints; the ninth and tenth very nearly equal in 

 width and length; eleventh slightly transversely oval. Prothoracic 

 basal impressions usually deep. The tubercles formed by union of 

 the fifth and seventh convex elytral intervals more elongate on summit 

 of the declivity. (Fig. 1, C.) 



Measurements. — Length (type) 6 mm.; width 2.2 mm. 



