6 American Midland Naturalist Monograph No. 1 



as savignVi and iuricaia but with the increased numbers of species now known 

 it is more appropriate to include under the term all similar structures on the 

 integument in Orniihodoros. Fig. 1, A. 



MEASUREMENTS: All measurements are recorded in millimeters. The articles of the 

 legs are measured dorsally. The articulations "telescope" on the ventral side but 

 are fixed or hinged dorsally. The length of the hypostome is measured from the 

 ,posthypostomal hairs to the tip of the hypostome. 



Micromammillae : Very small, rounded elevations of nearly uniform size on the sur- 

 face of the legs, and sometimes on the capitulum as in Orniihodoros lalaje and 

 O. rudis. 



MAMMILLAE 



_ DORSO - VENTRAL 

 GROOVE 



SUBAPICAL DORSAL 

 PROTUBERANCE 



TARSUS IV 



-DORSAL HUMPS 



-METATARSUS IV 



SUBAPICAL DORSAL jg 



PROTUBERANCE *' 



TARSUS I 

 - DORSAL HUMPS 



ME TA 



TA R S U S I 



CAWEROSTOME 

 MOUTH PARTS 



POSTHYPOSTOMAL 

 HAIRS 



BA5IS CAPITULI 



TROCHANTER I 



^C&K- 



•s aa-wc i&c-v-y: * ^^.".r 



r 



-FEMUR IV 



TROCHANTER IV 



ft 



Va 



_HYPOSTOME 



BASIS CAPITULI 

 ' CAMEROSTOME 

 .PALPUS PALPUS 



HYPOSTOME 

 HOOD p 



3ASIS CAPITULI 



Fig. 1. Principal characters of Argasidae. A, Dorsal. B, Lateral and ventral. C, 

 ventral, anterior. D, Leg IV. E, Leg I. F, Capitulum, ventral. G, lateral, anterior. 



