244 bulletin: museum of comparative zoology. 



Repugnatorial pores on fifth, seventh, ninth, tenth, twelfth, thir- 

 teenth, and fifteenth to penult segments. 

 Genotype. — T. thaumastus, sp. nov. 



208. Tomodesmus thaumastus, sp. nov. 



Tijpe. — M. C. Z. 4,527. 9. Cuba: Guantanamo, Mt. Libano, 

 Las Termapilas, March 30, 1913. C. T. Ramsden. 



Body pale green throughout excepting that the prozonites across 

 anterior ends above may show a rust-brown coloring. Legs and 

 antennae yellowish. 



First dorsal plate deeply subrectangularly excised on each side of 

 the convex middle region in front, the lateral wings comparatively 

 narrow anterocaudally, their anterolateral corner rounded convexly. 



Third, fourth, fifth, sixth, and seventh keels with a distinct single 

 lateral serration toward anterior corner. Keels in front of porigerous 

 cylinders becoming lower and more obscure caudad. Porigerous 

 processes of eighteenth somite much smaller than the preceding ones. 



Mesal borders of anal valves strongly elevated. Process of last 

 tergite much exceeding the valves, moderately decurved. 



Type-specimen consisting of but nineteen segments in addition to 

 the head but perhaps not fully mature. 



Length, about 34 mm.; width, 5 mm. 



Zigwadesmus, gen. nov. 



In this genus the keels in the middle and posterior regions are 

 exceedingly slight, occurring only as weak ridges excepting the process 

 bearing the pores which is distally obliquely truncate, the section 

 being long elliptic and bearing the pore near its center. The first 

 few keels are nearly normal. Keels inserted low down, near middle 

 of height. The dorsum high and strongly arched, wholI\' smooth. 



Anal scutum produced into a narrow caudal process which at the 

 distal end bears two slender conical processes giving it a character- 

 istically furcate appearance. The anal ^'alves are strongly margined 

 and elevated along the mesal edge. 



Repugnatorial pores on fifth, seventh, ninth, tenth, twelfth, thir- 

 teenth, and fifteenth to nineteenth somites. 



Antennae of moderate length, slender. 



Genotype. — Z. hrumums, sp. nov. 



