29O CALIFORNIA ACADEMY OF SCIENCES. |Proc. 3D Ser. 



309. Datames putnamii, sp. nov. 



Plate XVII, Fig. 29. 



Length t 22-24 mm - (exclusive of mandibles); mandibles 5 mm. long; 

 upper finger 5.5 mm. long; head 6 mm. broad; tibia of palpus 7.5 mm. long. 

 Head and mandibles reddish yellow, former margined with black in front, 

 fang red-brown; abdomen above dull blackish or purplish, hardly darker in 

 the middle, paler beneath; legs and palpi pale yellowish, tips of latter scarcely 

 darker. Head broader than long, straight in front; eyes separated by nearly 

 their diameter; mandibles of the usual shape, upper finger unarmed, lower 

 with a large tooth toward the base, and a small one just beyond; between the 

 two fingers, on the fond of the jaw, there are two rows of three teeth each, 

 and above these two little denticles. Legs and palpi moderately hairy and 

 spined as usual; there are no small conical spines on the metatarsi of palpi, 

 but long spines on the tibiae; on the middle of the hind margin of the fourth 

 ventral segment there are four short stiff spine-like appendages (not in ? ). 

 Aside from sexual differences, the ? is similar to the male, except larger. 



Several specimens from Sierra San Lazaro, Sept., and 

 San Jose del Cabo, Oct. This species differs from D. 

 girardii in pale legs, head, and mandibles, in lacking a 

 tubercle at the base above on upper finger of mandible, and 

 in lacking conical spines on the metatarsus of palpus; the 

 armature of the mandibles is, however, nearly the same, 

 but the small teeth on the lower finger are almost invisible, 

 the tip of this finger is not so curved, nor is it indented be- 

 low as in D. girardii. 



310. Datames, sp.? — One pair from San Jose del Cabo 

 appear to belong to a different species than D . formidabilis, 

 although quite similar; yet additional material would, I 

 think, be necessary to decide the question. 



311. Cleobis peninsulanus, sp. nov. 



Plate XVII, Fig. 30. 



Length 14 mm.; head 3.8 mm. long, broad 4.2 mm.; mandibles 4.2 mm. 

 long (including upper finger) ; tibia of palpus 5 mm. long. Cephalothorax 

 and mandibles yellowish, the tips of the fingers red-brown; legs and palpi 

 pale yellowish, the palpi with tibia (except at extreme base and tip) reddish 

 brown, and the metatarsi and tarsi entirely reddish brown; abdomen light 



