Occasional Papers of the Muscimi uf Zoology 59 



Holotype, M. C. Z., 5,147. 



The dark color of these specimens is due in considerable 

 part to foreign material and growths held by the granules and 

 numerous short setae, the parts more free from this showing 

 a fulvous background. 



Alassodesmus, gen. nov. 



A genus close to Trachelodesmus, but differing from the 

 latter in lacking repugnatorial pores on segments 12 and 15, 

 and in their presence on segment 14, the pore-formula being 

 — , — , 9, 10, 13, 14, 16-19. Pores large and conspicuous. 



Genotype, A. reductiis, sp. nov. 



Alassodesmus reductus, sp. nov. 

 PI. 22, Figs. 150-153 



General color light brown. Legs lighter, more fulvous. 



Differing conspicuously from Trachelodesmus, as repre- 

 sented, c. g., by T. ancylophor, in the weaker development of 

 the keels, the tergites at the sides merely bulging convexly, 

 and the absence of definite polygonal areas above and of the 

 larger tubercles, the marginal tubercles being small like the 

 others, or a few but slightly larger and more conical. The 

 repugnatorial pores open laterally, not elevated on tubercles, 

 each surrounded by a rim which may be slightly raised; above 

 each pore usually two or three small tubercles, of which the 

 caudal one is larger, and on most caudal segments corners to 

 project as a small, distally rounded, caudal process. Pores 

 present on segments — , 9, 10, 13, 14, 16-19. Dorsal surface 

 of metazonites finely roughened, granular or sharpened both 

 above and below. Sides of metazonites coarsely granular 

 under the keels, the granules becoming finer and sparser below. 

 (PI. 22, Fig. 150.) 



