Zool.— Vol. I.] BANKS— MEXICAN ARACHNIDA. 291 



gray, with a darker light chocolate brown stripe, most distinct on the margins 

 and on the median line. Head broader than long, anterior margin retreating 

 each side from the eyes, which are fully their diameter apart, median groove 

 plain, only short hairs on the head. Mandibles long and stout, with bristles 

 of moderate length; both fingers much curved at the tip, the upper one with 

 several small teeth, the lower with two larger teeth and a small one between 

 them; on the upper finger above, near base, is an elongate elevation or ridge. 

 Palpus clothed with short fine hair, the tibia plainly enlarged before tip; legs 

 as usual, with short hairs and bristles; the triangular piece at base of venter 

 shows a narrow median groove on its posterior half. 



Several specimens from San Jose del Cabo, and one from 

 Hermosillo. 



312. Cleobis hirsuta, sp. nov. 

 Plate XVII, Fig. 31. 



Length n mm.; head 2.7 mm. long, broad 2.8 mm.; mandibles (including 

 finger) 3 mm. long; tibia of palpus 5 mm. long. Cephalothorax pale yellow- 

 ish, rather reddish on the sides, leaving a pale central diamond-shaped fig- 

 ure; eyes on black spots; mandibles pale yellowish, a paler stripe above, 

 fingers reddish at tips; palpi rather yellow brownish on all except the basal 

 joint. Legs and abdomen pale, the latter with a median light brown stripe 

 above. Head about as broad as long, the front margin recedes each side from 

 the eyes, the latter much more than their diameter apart, the median groove 

 distinct. Mandibles longer than head; fingers short, the upper one is emar- 

 ginate above and also externally, below with two small teeth and some minute 

 denticles toward the base; the lower finger has two rather large teeth; both 

 of the fingers strongly curved at tip. The palpi, legs, and abdomen are as 

 usual; the body is more hairy than usual, and on the appendages the hairs 

 are extremely long, giving the creature a somewhat hoary appearance. 



One specimen from San Miguel de Horcasitas. Readily 

 known by the curious shape of the upper finger of the 

 mandibles and the long hair. 



ACARINA. 



313. Trombidium peninsulanus, sp. nov. 



Length 3.5 mm. Red; body somewhat pyriform, flat above, broadest in 

 front, concave each side near middle, slightly concave in front, broadly 

 rounded or even a little emarginate behind with several pairs of round im- 

 pressions above. Body clothed above with short dense erect nearly clavate 



