184 



PSYCHE. 



IMarch i8g8. 



having antennae, legs, claws and fur- 

 cula which are relatively much longer ; 

 in addition, the superior claws are tri- 

 dentate, the mucrones are not nearly as 

 falcate as in 6". californica., while the 

 general pilosity is much less and the 

 clavate dorsal hairs fewer and differently 

 disposed. Schott makes no mention of 

 barbellate hairs in the description of 

 S. calif ornica. 



Machilis conjuncta, n. sp. General color 

 blackish brown ; the rubbed, alcoholic speci- 

 men which I have drawn (Fig. i) is white 

 with dark, brown mottlings. The head, legs 

 and subabdominal appendages are almost 

 white. Head small. Eyes black, nearly 

 spherical and united more broadly than usual 

 (Fig. 2), in allusion to which the species is 

 named. Antennae at least twice as long as 

 the body and conspicuously annulated with 

 brown; basal segment (Fig. 3) stout, cylin- 

 drical, two-thirds as broad as it is long; 

 second segment subcylindrical but broader 

 than long. Maxillar3' palpi slender with seg- 

 ments that are nearly cylindrical, simple, 

 and in length as i : 2 : 3 : 34 : 4 : 3 : 24. Labial 

 palpi with segments as i : 2 : 3 ; basal segment 

 globose; second, cylindrical; third, stout, 

 and crescentic in lateral aspect. Body rather 

 cylindrical, butslightly tapering; the relative 

 lengths of its segments, as measured along 

 the median dorsal line, are about as 3 : 6 : 3 : 

 3:2:2: 24 :3:3:3:3:2: \\. Prothorax with 

 a prominent antero-lateral lobe; mesothorax 

 with an antero-lateral emargination. Legs 

 stout; trochanters obliquely separated from 

 the femora; femora much swollen ; the coxal 

 appendages of the mid- and hind-legs are 

 slender and conical. The subabdominal, 

 paired appendages, occurring, as usual, only 

 upon abdominal segments two to nine, inclu- 

 sive, are conspicuous and slender. Median 

 cercus at least longer than the body and 

 annulated; lateral cerci much smaller, about 

 half as long as the median cercus and simi- 



larly annulated. Scales (Figs. 4-6) extreme- 

 ly variable, as already remarked. 



Length 13 mm., excluBive of appendages. 

 Described from a single type, which has been 

 deposited in Museum of Comparative Zool- 

 ogy at Cambridge, Mass. 



Seira mexicana n. sp. Usual color black- 

 ish purple, with a conspicuous yellowish- 

 white band on the anterior part of the fourth 

 abdominal segment, occasionally obliterated ; 

 often every segment is b;inded, as in the spec- 

 imen which I have represented (Fig. 7) and 

 will describe with some detail. Head with 

 an irregular, white, dorsal patch surrounded 

 with purple. Eyes present, normal. Anten- 

 nae slender, over twice as long as the head; 

 antennal segments cylindrical, purple with 

 pale bases, and in length as 2 : 3 : 3 : 4. Body 

 rather cylindrical, sparsely hairy, with three 

 dorsal clusters of clavate hairs. Mesonotum 

 not projecting. Legs slender, the hind pair 

 longest; coxae and trochanters purple, the 

 remaining segments yellowish-white; tibiae 

 furnished with barbellate hairs and also a 

 single tenent hair; superior claw (Fig. 8) 

 straight, slender, tapering and tridentate; 

 inferior claw about half as long, broadly 

 linear, acute and simple. Furcula attaining 

 the ventral tube; manubrium purple, sparsely 

 hairy; denies white, subequal to manubrium, 

 slender, strongly crenulate (Fig. 9), with 

 stiff, barbellate bristles, except at the apes of 

 each dens, which is slender and bare; mu- 

 crones consisting of a simple, slightly falcate 

 segment. Scales varying from elliptical-oval 

 (Fig. 10) to narrow-elliptical, thickly covered 

 with minute, lanceolate markings and having 

 a long, linear pedicel. Fig. 10 represents a 

 scale from the dorsal part of the abdomen ; 

 on the ventral side of the abdomen the scales 

 are three times as long and narrowly-ellipti- 

 cal. 



Length, 2 mm. Described from fifty-two 

 types, some of which have been given to the 

 Museum of Comparative Zoology, at Cam- 

 bridge, Mass. Mr. Barrett informs me that 

 he has retained duplicates of this species for 

 Museo Nacional, of Mexico City. 



