DESCRIPTION OF A TICK, DERMACEXTOR HALLI, FROM 

 THE TEXAS PECCARY, WITH A KEY TO THE XORTH 

 AMERICAX SPECIES OF DERMACEXTOR 



By Allex McTxtosh 



Assisidiif Zoolofjist, Zoohxjicul Division, Bureau of Animal Industry, United 

 States DciKirtnient of Agriculture 



Ainoiig: a collection of parasites made on September 3, 1931, by 

 Dr. Maurice C. Hall, chief of the zoological division of the United 

 States Bureau of Animal Industry, were several ticks taken from five 

 collared peccaries, also known in Texas as javelinas, which were 

 shot on the King- Ranch, Kingsville, Tex. The ticks were turned 

 over to the writer for identification, and were found to rejnvsent the 

 following species: Amhh/omma cajennense, Dcrmacentor variabilis, 

 and a species of Dcrmacentor regarded by the writer as new.^ 



DERMACEXTOR HALLI Mcintosh, 1931 



Male: Body oval (fig. 1, a), narrowing anteriorly, broadest at 

 coxae lA'; 4.3S mm long (capitulum not included); 2.8 mm wide. 

 Scutum (pi. 1, fig. 1) reddish brown, fading to yellowish brown in 

 the mesal region posterior to pseudoscutum, with an extensive pattern 

 of white rust. The white consists of a narrow border along the 

 lateral margins beginning somewhat posterior to the eyes and encirc- 

 ling the festoons ; along the mesal border of each lateral groove is 

 a faint trace of white ; beginning near the apex of each scapular 

 angle is a hroacl white stripe extending on each side to the first and 

 second festoons. 



These two stripes, the most conspicuous of the Avliite markings, 

 I'un almost parallel to about the center of the scutum, where, after 

 a slight convergence, they diverge in their course to the festoons. 

 Beginning near the inner border of each cervical groove is a narrow 

 stripe of white : these two stripes soon unite and expand as irregular 

 broken patches of white over the posterocentral portion of the pseu- 

 doscutum ; the two stripes are reformed and continue posteriorly in 

 a slightly diverging direction to anastomose as a rule, although in 

 some specimens the union may be broken, with the hroad white stripe 



^ An abstract of this paper was pubUshed in the Proceedings of the Seventh Annual 

 Meeting of the American Society of Parasitologists. Journ. Parasit., vol. 18, no. 2, 

 p. 124, Dec, 1931. 



No. 2945.— Proceedings U. S. National Museum, Vol. 82, Art. 4 



13058G— 32 1 



