1910] Diplopoda from the Western States 241 



Gnathochilarium with lingual lamellae, inclusive of processes, 

 about 3.8 times as long as the greatest width which is anteriorly. Sti- 

 pites inclusive of processes, about 4.25 times as long as the greatest 

 width. Greatest width of mentum apparently three times the length, 

 though the caudal margin was made out with some uncertainty. Pro- 

 mentum distinct and well developed. Spathula evident. Stili not 

 detected. 



Size approximately that of T. utahensis. 



Locality — Pacific Grove, California (June, 1902.) 



Caseya irritans sp. nov. 



General color in alcohol light brown; indications of pale, whitish 

 transverse bands, one across each segment, and of a row of whitish 

 spots laterally. Venter and the feet yellowish. Head with the vertex 

 pale, finely areolated in brown; frontal region brown, a distinct pale 

 spot ventro-mesad of each antenna, the spot transversely elongate, 

 and a median pale spot immediately dorsad of the inner ends of these 

 two spots; clypeal region pale; labrum yellow. 



Head widely excavated caudad. Vertex transversely elevated, 

 smooth and shining in the specimen as at present, crossed by a faintly 

 developed fine median longitudinal line. Frontal and clypeal region 

 of head sub-complanate ; a conspicuous transverse impression above 

 clypeus, indented or bent dorsad mesally. 



Eye patch elongated in a meso-ventral direction. Ocelli strongly 

 •developed, 13 in number and arranged in three series, which, counting 

 from above toward antennae are as follows: 7, 5, 1 ; on one side the series 

 .appearing rather as four, 1, 6, 5, 1. 



Antennae long and slender, scarcely clavate. The third article 

 much longer than the fifth; the seventh much smaller than the sixth, 

 "being but little more than half its length. 



Promentum moderately large, triangular; mentum a little less than 

 three times as wide as the median length. Length of lingual lamellae, 

 inclusive of processes, a little less than three times as large as the great- 

 est width, which is caudad of the middle. Stipites, inclusive of pro- 

 •cesses, about 4.4 times as long as the greatest width. Sensory cones 

 of outer process of stipes 5 or 6 in number, of inner process apparently 

 6. Stili not detected. 



First dorsal scutum sub-reniform, the anterior median portion 

 rather narrowly protruding. Caudal margin with lateral angles evenly 

 rounded, the median portion almost straight, slightly obtusely indented 

 at mesal line. A fine median longitudinal line impressed across caudal 

 portion of plate. Lateral regions of segment marked with numerous 

 fine oblique striae, there being similar striae on the anterior rounded 

 median portion but these extending but little caudad. 

 Body fusifonn, attenuated both caudad and cephalad. 

 Segments caudad of the first with numerous striae over sides be- 

 neath ; on the second there are three striae above the obsolete shoulder- 

 like bulging occurring where carina would usually be developed, on the 



