Occasional Papers of the Museum of Zoology 7 



Siphonophora guianana, sp. nov. 



PI. 4, Figs. 25-27 



Color in general dark brown. 



Head subglobose, suggesting that of pcarsei, but a little 

 longer and not quite so abruptly narrowed to base of the beak. 

 Beak short and straight. Antenna proportionately thicker than 

 in pearsei, gracilicornis, etc., as shown in PI. 4, Fig. 25. 



Body broad and depressed. Pores elevated on broad tuber- 

 cles, which are more pronounced and keel-like in posterior 

 region. Body uniformly densely pilose, the hairs short. 



Collum in dorsal view trapeziform, rather strongly nar- 

 rowed forward ; the sides straight ; the anterior margin mesally 

 moderately incurved. (PI. 41, Fig. 25.) 



Pleurites of anterior segments with mesal margin weakly 

 incised at middle ; cephalomesal angle not produced ; outer 

 portion of anterior margin carried forward as usual, obtusely 

 angled, the mesal part of margin convex ; caudal margin con- 

 vex. (PI. 4, Fig. 26.) Pleurites of posterior segments with 

 outer portion of anterior margin nearly straight, the angula- 

 tion small or often obsolete, the inner weakly concave, mesal 

 margin weakly incurved. (PI. 4, Fig. 27.) 



Number of segments in the type, yy. 



Length, about 32 mm. ; width, 2.5 mm. 



British Guiana: Forest Sand Hills; Aug. 6, 1914; F. M. 

 Gaige. One female collected on ground. Holotype, M. C. 



z., 5.050. 



One female from University of Michigan Expedition Sta- 

 tion 165 without further data. 



Labba Creek Sand Hills; July 27, 1914 : F. ^l. Gaige. In 

 sandy soil of forest floor. One female. 



