82 GEORGE H. HORN, M. D. 



those from the salt marshes of Owen's Valley, a region which has in 

 many instances shown itself to be more closely allied in its fauna to 

 San Diego than the circumjacent desert regions. 



C. hipunctatus is a large species similar in its coloration to tricolor. 

 There are on the disc of the thorax two small elongate black spots placed 

 obliquely like the pale spots of the thorax of Hippodamia convergent, 

 but diverging toward the base. In our series of this species may be 

 found specimens varying in a manner similar to that between tricolor 

 zndi punctatus and between eximius and nigriceps, that is, while many 

 specimens have dusky abdomen and legs almost entirely black others 

 again have the anterior and sometimes the middle legs rufous and the 

 abdomen pale. Occurs from Kansas to Arizona. 



C marginicoUis must be associated with nigriceps and eximius. The 

 discal black spot is very large having but a narrow pale line which ex- 

 tends around the entire margin. As compared with either of the 

 above mentioned species the thorax will be found more transverse but 

 less rounded on the sides. The anterior legs and middle femora are 

 rufous. C. cribrosus has a narrower thorax than either of those men- 

 tioned. Occurs at San Diego, Cal. 



C. validus, n. sp. — Head in front of the eyes pale rufous, vertex and occiput 

 blacli, finely and sparsely punctured. Thorax rufous with a black spot on each 

 side of middle; twice broader than long, sides moderately rounded, broader be- 

 hind the middle; surface smooth, shining with but few fine distant punctures. 

 Elytra robust, pale rufous with a basal blue spot on each attaining the epipleura 

 at humerus, narrowly separated at the suture, and a sub-apical larger spot 

 equally distant from suture and apex but nearer the lateral margin ; surface 

 densely punctured. Body beneath, legs and antennae pale rufous ; meso-, meta- 

 sternal and gular regions black. The entire surface of the body is sparsely 

 clothed with cinereous hair and the upper surface with few erect short black 

 hairs. Length .30 inch ; 7.5 mm. 



A large species with head and thorax resembling hipunctatus aud 

 elytra marked as in quadrimaculatus. 



This species is rather larger in size and more robust than any at 

 present known to me. It may be known at once from any of our 

 four-maculate species by the pale legs and thoracic spots. 



A very few specimens were collected by Dr. Palmer near the 

 mouth of Yaqui River, Sonora. 



C. quadrimaculatus and histrio resemble each other very closely, 

 having exactly similar colors. The thorax of the former is smooth 

 and shining, the latter sub-opaque, densely and very finely punctured. 

 The former species is widely distributed, a single specimen of the 



