OF WASHINGTON. 



199 



EXPLANATION OF PLATE II. 



FIG. 



la. 

 ib . 

 ic. 



id. 

 le. 

 i/. 

 ig. 

 ih. 

 if. 

 FIG. 



i. RHYNCHOPRIUM SPINOSUM, dorsal 



view. 



Ventral view. 



Young, Capitulum not redrawn. 

 Full-sucked individual, Capitulum pro 



jected. 



Capitulum, dorsal view. 

 Maxillse. 

 Mandibles. 

 Stigma. 

 Front foot. 



Haller's organ of hearing. 

 2. ORNITHODORUS AMERICANUS, dor 



sal view. 

 Ventral view. 



Side view of anterior portion. 

 Position of Capitulum in full-sucked 

 state. 



zd. Capitulum, dorsal view. 

 ze. Maxilla;. 

 2/1 Stigma. 



zg. Female sexual orifice. 

 zh. Front foot. 



21. Haller's organ of hearing. 

 FIG. 3. ARGAS AMERICANUS, dorsal view. 

 3*. Ventral view. 

 3^. Side view of anterior portion. 

 y. Larva, dorsal view. 

 3^. Larva, ventral view. 

 3^. Capitulum, ventral view. 

 3 /. Mandibles. 

 3^-. Maxillae. 

 3^4. Stigma. 

 3/. Front foot. 

 -$k. Haller's organ. 



LIST OF THE ENTOMOLOGICAL WRITINGS OF GEORGE MARX. 



1 . On some new tube-constructing spiders. 



Amer. Naturalist, vol. 15, May, 1881, pp. 396-400; 8 figs. 



2. [List of spiders observed to feed on the cotton worm (Aletta 



argillacea], w r ith a biological note on Theridula sphce- 

 rnla. 



Fourth Report U; S. Entomol. Comm., Washington, D. C., 1885. 

 Appendix, pp. [io6]-[io7]; plates XIII and XIV. 



3. Description of Gasteracantha rufospinosa. 



Entomol. Americana, vol. 2, no. 2, May, 1886, pp. 25-26; fig. 



4. Notes on Thelyphonus Latr. 



Entomol. Americana, vol. 2, no. 2, May, 1886, pp. 38-40; plate I. 



5. Notes on Phrynus Oliv. 



Proc. Entomol. Soc. Washington, vol. i, no. 2, March, 1888, pp. 

 46-47. 



6. [Remarks on the types of Scorpionidae described by Wood. 



Proc. Entomol. Soc. Washington, vol. i, no. 2, March, 1888, pp. 



90-91. 

 y. On the morphology of Scorpionidae. 



Proc. Entomol. Soc. Washington* vol. i, no. 2, March, 1888, pp. 

 108-112; figs. 1-3. 



8. Eurypelma -ril^i Marx, n. sp. 



Proc. Entomol. Soc. Washington, vol. i, no. 2, March, 1888, pp. 

 116-117. 



9. On a new and interesting spider [Hypochihis thorellii~\. 



Entomol. Americana, vol. 4, no. 8, November, 1888, pp. 160-162; 

 plate. 



