EEVISTON OP ELEODIINI BLAISDELL. 383 



cordata acquires a rugoseiiess of sculpturing and inmelioides a tuber- 

 culate form of elytral markings. 



They are to be considered as two divergent forms derived from a 

 common ancestral ramus. 



Specimens from Oregon have the prothorax rounded on the sides, 

 as in 'parvicoUis and scahrosa (see rotwidipennis) . 



Specimens from southern California collected by Doctor Van Dyke 

 are remarkable among those of the large series before me on account 

 of their elongate form, measuring: Length, 15 nnn. ; width, G.5 mm.; 

 elytra more elongately oval {foi'ma elorigata). These specimens 

 approach an unique male from Amador County, in which the form is 

 elongate oblong, thorax as in cordata^ antennae long and stout, and 

 the elytra are distinctly tuberculate and not rugose. The whole 

 habitus is that of a stout, oblong cordata {forma ohlonga). Length, 

 IG mm. ; width, 7 mm. These are remarkable variations from the 

 monotonous short, robust, normal form. 



Mannerheim's types of intricata were taken about Fort Ross, Cali- 

 fornia, by Doctor Fischer, and I can not see that it diifers in any 

 essential characters to give it even varietal standing. Many females 

 have the " thorace transrerso, lateinhus valde rotundatisy In a large 

 series of cordata a variation in the length and stoutness of the an- 

 tennae and legs, independent of sex, may frequently be observed. 

 The humeri vary considerably also, never prominent, but frequently 

 subangulate and always more or less rounded. 



Tvherculata Eschscholtz is to be disposed of in the same way as 

 intricata. For sticta, see p. 384. 



General observations. — The mentum is usually moi-e or less trian- 

 gulo-trapezoidal and rather small, finely sculptured, feebly foveate 

 laterally, and very slightly convex at middle. 



The prosternum is variable, usually rather prominent ventrally 

 with the coxse, and quite strongly arcuate antero-posteriorly, without 

 a mucro; frequently a small mucro is present at middle of the pos- 

 terior edge; rarely horizontal, subtruncate behind, and more or less 

 feebly mucronate. 



The mesosternum is vertically arcuate and more or less broadly 

 and deeply concave. 



The metasternum laterally between the coxse is as long as the width 

 of a mesotibia at middle. 



The abdominal process is subquadrate, equal in width (female) or 

 a third (male) of its width broader than the metasternal salient. 



In the male the post-coxal part of the first segment is equal in 

 length to the third ; the second to that of the process and twice as long 

 as the fourth and about a fifth longer than the third. 



In the female the post-coxal part of the first segment is equal in 

 length to that of the process and also to the second, the latter being 



