44 BROOKLYN MUSEUM SCIEKCE BULLETIN 3. 2. 
ian region being at most straight or a little convex, not at all incurved. 
The ventral furrows are very much more deeply impressed than in tulaje; 
the preanal transverse furrow is notably wade and deep, deeper than the 
others, whereas in hdaje it is typically narrow and comparatively weak 
with the median and oblique furrows becoming obviously deeper caudad. 
Lateral wings of the camerostoma low, never lapping over the mouth- 
parts. Anterior emargination of the rostrum narrower and deeper than 
in tulaje. Chelicerae with structure as in the latter species or nearly so. 
Second joint of legs characteristically thick in comparison with the 
succeeding ones; distal joints without dorsal processes or tubercles. 
Locality. — Peru: Chincha Is. Numerous specimens were collected in 
Oct., 1919. Type, Museum of Comparative Zoology, 526; paratypes, 527, 
and Brooklyn Mu.seum. 
Dr. Murphy notes that these ticks are of a type " extremely abun- 
dant on all the Peruvian guano islands. They live in the soil and the 
guano. Color in life very pale, darkening in the preserv^ative." The 
body in all the specimens at present is fuliginous with legs pale fulvous. 
Larval specimens from the plumage of an adult penguin {SpheJiisais 
humboldti) , noted as having in life a reddish color, may pertain to this 
species. Thej^ are broader, more nearly circular in outline, than the 
larvae taken from the booby on Lobos de Tierra Id. (probably those of 
O. tii/aje as previously noted), but appear to become gradually more 
elongate with increasing size. 
Explanation of Plate. 
Fig. I. Uroctonoides fractus, sp. nov. Chelicera, ventral view, with movable finger 
a little twisted to show teeth of upper margin. 
Uroctonoides fractus, sp. nov. Comb of right side, ventral view. 
Chinchippus peruvianus, sp. nov. Mandible, ectal view. 
Loxosceles accepta, sp. nov. Left palpus of male, ectal view. 
Loxosceles accepta, sp. nov. Tibia, tarsus and bulb of male palpus in 
dorsal view. 
Loxosceles nesophila, sp. nov. Eyes, dorsal view. 
Tetragnatha aptans, sp. nov. Right chelicera of female, ventral view. 
Tetragnatha aptans, sp. nov. Subdistal view of left chelicera showing base 
of claw and ventral process. 
Sitticus mazorcanus, sp. nov. Palpus of male, ventral view. 
Ornithodoros amblus, sp. nov. Anterior end, dorsal view. 
Fig. 
2. 
Fig. 
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Fig. 
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Fig. 
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Fig. 
6. 
Fig. 
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Fig- 
8. 
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Fig. 
10 
