PROC. ENT. SOC. WASH., VOL. 21, NO. 9, DEC., 1919 199 



of the second segment and a long blunt curved spine at the apices of each 

 of the last three segments, the measurements of the segments in microns as 



follows: 



legs long and slender, the fore pair a little shorter than the other two, an average 

 length of a middle leg as follows: coxa, 78.5yu; trochanter (maximum), 82 ,u, fe- 

 mur (maximum), 385.11; ibia (maximum), 410/*; tarsus (not including chuv . 

 153/n; claw, 53 ju; tarsal digitule, 68 ,u; claw digitule, 43 n; claw elongate, slender, 

 straight with a slight curve near the apex, without denticle, all digitules very- 

 slender, hair-like, slightly knobbed at apices; all trochanters with the usual dor- 

 sal and ventral pairs of oval pores, or four altogether on each; hind coxae with- 

 out pores, submentum triangular, acute at apex, appearing very obscurely 3-seg- 

 mented ; dorsal ostioles very obscure, only the posterior pair noted ; cerarii of an 

 unusual type, consisting normally of a pair of spines (varying from one to 

 three) surrounded by a solid continuous band of heavily chitinized trilocular 

 pores with confluent outer borders forming a continuous chitinized rim 

 around the whole, and the posterior cerarii, at least, with an indistinct chit- 

 inized area around each cerarius, the anal lobe cerarii each with a small 

 hair in its rim on the inner side, this not noted on any of the others except 

 the anterior pair each of which bears from one to four such hairs; with an 

 approximately circular group of short tubular ducts, each with a chitinized 

 plate surrounding the opening, around each cerarius; in addition to these 

 clusters of short tubular ducts surrounding the typical cerarii, with other 

 clusters on the anterior body margins in which the cerarius is missing or 

 is represented only by a single spine; assuming these clusters of tubular 

 ducts to stand for more or less developed cerarii, then with normally a total 

 of fourteen pairs, the arrangement of these in ten specimens being tabulated 

 below (the numerals and signs with the following significance : the first 

 numeral giving the number of spines present, connecting symbol indicating 

 the presence or absence of a number of trilocular pores around the spines, 

 the final numeral indicating the number of hairs in the cerarius border, thus 

 3 + 1 = three conical spines, numerous trilocular pores and one hair in the 

 border of the cerarius; an * indicating the presence of a single trilocular 

 pore; ** indicating the presence of two such pores): 



