2 22 TJie species of Amblyclnla. [zoe 



Cylindriformis Say (not of Thomson) is closely punctured all 

 over the elytra with large and small punctures on a rugulose 

 ground. Picolominii and JBaroni have but few punctures, far 

 apart on a smooth ground and flat surface. The number of 

 punctures in each species should be noticed: in cylindriformis 

 there are about 230 — 240 on the central or sutural line and near 

 the suture there are about 40. In Picolominii the whole number 

 in the same area does not number over 40, while near the suture 

 there are but three or four. On the deflexed portion of the 

 elytra and covering the apex, large punctures occup)- all avail- 

 able space. On the same part in the other species the apices are 

 smooth. 



Cylindriformis. Picolojiiinii. 



Length, 30 m.m.; color, browu- Length, 25 m.m.; color, deep 



ish; surface of elytra rugulose and black; surface of elytra smooth and 



irregularly punctate; apex of elj'tra regularly punctate; apex of elytra 



very coarsely punctured. with punctures scarcely visible. 



Locality Peach Springs, Truxton Valley, N. W. Arizona. 

 Altitude, 5000 feet. 



Peach Springs is about sixty miles from the nearest boundary 

 line of Nevada, and about eighty miles from the Californian 

 state line. The regions traversed by the Colorado of the west 

 and its western tributaries .seem to be th,e habitat of Picolominii. 

 The original statement that it was found near the Port and Bay 

 of San Francisco, in New California, is presumably a mistake. 

 The confusion may have arisen from copying from the ship's log, 

 which gave the final clearing from the western coast as the port 

 above cited. But I think that Picolomini went up the Bay or 

 Gulf of California, and then followed the course of the Colorado 

 and Gila Rivers. What suggests such a course is the fact that 

 Baro7ii was found on the Gila and the Picolominii on the Colorado, 

 and possibly Picolomini took his example a ? in the San Fran- 

 cisco Mountains. 



The original description of ^. Picolominii is appended. 



Ambi^ychila Picoi^ominii Dupout Collection. (Voyez PI. 19, fig. 

 I a 6.) 



Longueur 28 millim. largeur, 9 millim. 



Ater, nitidtii; capite hevigato; thorace subqnadrato, hcvigato subcanalicidalo; 

 elylris obsolete punctulatis, lineis tribus elevatis; interstitiis, piincte profunde 

 itnpressis. 



