38 Proceedings of the Biological Society of Washington. 



Strophobolus immigrans, sp. nov. 



Dorsum with a broad longitudinal stripe of orange color geminate by 

 a narrow median black stripe and limited laterally by the black of each 

 side. Venter yellow of orange cast, the light color extending part way 

 up the side on each metazonite. Collum black, the median region with 

 obscurely lighter areolations as common in related forms. Legs yellow- 

 ish of slight orange cast. Antennae dusky over a fulvous ground. 



Vertigial sulcus weak, in a slight depression. Sulcus again evident 

 over lower part of clypeus. Antennae short; sensory cones four. Ocelli 

 numerous, distinct, in five sub vertical series, e. g., 9, 9, 9, 6, 2. 



Collum narrowed down each side, each end rounded. Margined be- 

 low and up the front but otherwise not striate. Second tedgite not ex- 

 tending below its level and not produced beneath it. This segment 

 strongly striate beneath like the following ones. 



Segments in general with the encircling furrow rather deep and dis- 

 tinct. Pore widely removed from the furrow. Truly longitudinally stri- 

 ate only beneath but prozonite with weaker lines curving forward and 

 upward from the furrow on the sides. Particularly in the dorsal region 

 with lunate and semicircular impressions along the furrow or near it, 

 their concavities mostly caudad. Metazonites smooth. 



Anal tergite caudally rounded, not at all projecting, the valves extend- 

 ing beyond it. Valves with mesal borders bulging, rounded, not at all 

 marginate. 



In the male the coxae of the third to seventh pairs of legs flattened and 

 extended ventrad in low, rounded or subconical elevations. 

 Number of segments (cf), forty-four. 

 Length, near 20 mm.; width, 2 mm. 



In addition to the type, an adult male, there is an immature individual 

 of twenty-seven segments and a length of 8.5 mm. Its coloration is 

 nearly as in the adult. 



Strophobolus australianus, sp. nov. 



A larger and more robust form than the preceding. Coloration nearly 

 the same, the body being conspicuously marked by a longitudinal dorsal 

 stripe of orange color divided by a median black line. Sides black, less 

 encroached upon by the light color from below than in immigrans. 



Sulcus distinct across vertex and again over the clypeus, on the latter 

 more sharply impressed. Antennae very short, Clypeal foveolae 4 + 4. 

 Ocelli larger and fewer than in the genotype, in four series, e. g., 8, 7, 7, 5. 



Collum nearly as in preceding species. Second tergite extending below it. 



Segments with longitudinal striae beneath and a little way up each 

 side, farther than in the preceding form, these striae on lower part of 

 sides extending through furrow and then curving forward and upward. 

 On the upper part of the sides the striae begin at or in the furrow and 

 then curve similarly forward and upward. Prozonite marked on dorsum 



