144 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Host. — Eutamias quadrivittatus. 



Location. — Small intestine. 



Locality. — Crested Butte Mountain, Colorado. 



Type material. — No. 16185, U.S.N.M. (Bureau of Animal Industry 

 helminthological collection) . 



This species is based on two males, 1 headless, collected from alco- 

 holic host material, for which I am indebted, as for much other mate- 



FiG. 190.— Warrenius quadrivittati. Bursa, ventral 

 VIEW. i. lobe, Dorsal lobe of bursa; c. d., externo- 



DORSAL ray; C. I., EXTERNO-LATERAL RAY; I. v., LATERO- 

 VENTRAL ray; m. I., MEDIO-LATERAL RAY; p. I., POSTERO- 

 LATERAL ray; V. lobe, VENTRAL LOBE OF BURSA; V. V., 

 VENTRO-VENTRAL RAY. 



Fig. 191.— W arkenius 

 quadrivittati. p o s t e - 

 rior extremity of male, 

 dorsalview. enlarged. 



rial noted in this paper, to Mr. E. R. Warren, after whom the genus 

 is named. 



GENUS UNCERTAIN. 



ANALYTICAL KEY TO UNPLACED SPECIES OF TKICHOSTRONGYLINAE. 



1. Found under the gastric mucosa Stronf/ylus leporum, p. 14S. 



Found in the intestine 2. 



2. No description ; found in small intestine of rut Strongylus species, p. 145. 



Described species ; not found in intestine of rat 3. 



3. Cervical alae present St7'ongylns ininutoides, p. 147. 



Cervical alae probably absent 4. 



4. North American species from Erethizon dorsatum (Hjfstri.r domata). 



Strongi/lus simplex, p. 145. 

 Not North American species and not from Erethizon (Hijstrix) 5. 



5. Dorsal lobe of bursa very large ; female more than 15 nun. long. 



Stronffijlus sedecimradiatus, p. 145. 

 Dorsal lobe of bursa small or lacking; female less than 15 mm. long. 



Strongyhis eavalli, p. 146. 



The above key is obviously makeshift in character and in part of a 

 rather unscientific nature, but in the absence of scientific clo-ta it is 

 obviously impossible to supply a key based on such data. 



