112 American Midland Naturalist Monograph No. 1 



sharply pointed shafts terminating in pointed digits (Fig. 2, 3) ; palps as long as 

 hypostome; joint 1 about twice as long as 3 ; 2 shorter than 1; 4 short, pointed, with 

 several apical spines. 



Recently hatched larva narrowly elongate; length 0.88 mm. as measured from apex 

 of capitulum to posterior margin of body; capitulum measures 0.44 mm. Body bears 

 rather numerous stout hairs with minutely spinous margins; integument shows, under 

 high magnification ( x 400), very fine parallel lines running transversely, forming a 

 more or less definite pattern; striate condition appears much more distinctly in mature 

 larva and resembles that of O. megnini. Hypostome heavily toothed (Fig. 4, b) ; 

 dentition 2|2; apex with several rows of minute denticles; chelicerae as long as hypo- 

 stome terminating in a two-toothed article; palps as long as the hypostome; joints 1, 

 2 and 3 of about equal length ; joint 4 is very short and bears numerous short, pointed 

 spines; scattered spines present on joints 2 and 3. Fully gorged larva measures 1.68 

 mm. in length. 



To the above it should be added that in the fed larva the capitulum is 

 plainly visible from above and the coxae are remote from the capitulum. 

 Hypostome on a conical base which is about as long as the hypostome itself. 

 Denticles of the lateral files much larger than the medians and both files 

 extend the entire length of the hypostome; basal denticles crowded and 

 deformed. 



HOSTS AND DISTRIBUTION 



From Matheson (1935) we quote as follows: 



Bats, Hemiderma perspicillatum aztecum (Saussure) ; Summit, Canal Zone, Nov. 12, 

 1930; this bat was found to be heavily infested with larvae and the nymphs and adults 

 were present in the cracks and crevices of the culvert where the bats roosted in masses. 

 Also taken on this same bat in a cave at Taboga Island, Panama Bay and on the 

 vampire bat, Desmodus rotundus murinus Wagner. This tick has also been taken in the 

 cracks and crevices of Chilibrillo Caves and in other caves and culverts in Panama 

 and the Canal Zone. 



Cuba. — Through the kindness of Dr. I. Perez Vigueras, University of 

 Havana, Havana, we have received other specimens as follows: 17158, 1 

 adult from walls of a bat cave, Holguin, Santiago de Cuba; 17497, 4 adults, 

 2 nymphs, 9 larvae, Cueva del Barro, Loma Blanquizar, Guanajay. 



Venezuela. — In 1941 Dr. Matheson of Cornell University kindly sent us 

 specimens of this species taken from bat caves in Venezuela. 



