AMKUrCAX Al'TERA. 73 



long, partially covered by a lobe one and oue-fourtli times as wide as long; some- 

 what like 0. scalaris, bnt the lobe not as broad and showing more of tlie wivity 

 each side. 



Ft. Collins, Colo. (Mrs. Baker). 



ATTID.E. 



PliiliiMiM iiionticola nov. sp. — Length 6.5 mm., cejih. 3 mm. lung, ^.^ mm. 

 bi'oad. Cephalothorax black, a broad white stripe each side, bnt not reaching the 

 hind margin, white on clypeus. a tuft of stitf black hairs just behind eyes of 

 second row, a smaller tuft behind lateral eyes of first row; mandibles slightly 

 iridescent greenish. Legs red-brown, tarsi i)aler, clothed with white hair, very 

 long under femur and tibia i ; sternum dark red-browu. Abdomen black, a nar- 

 row white baud around base, a broad tawny stripe on each u])perside; venter 

 with a white stripe each side; a white stripe on inner side of patella and tibia i, 

 a yellowish stripe above on tibia i; of the usual structu)e of the genus; there is 

 a short truncate projection at outer tip of tibia ; paljjal organ divided into two 

 parts, the lower and larger has a convex projection on the inner side ; on the outer 

 side there is near the tip a mark like that of /'. militdns ; the ujiper part is broader 

 than long, irregularly striate, with a black tube at tip, which is sinuate, and has 

 a simple ti]!. 



One 2n:ile, Ft. Collins, Colo., sweeping, May (Baker). 



Iciiis pleuralis nov. sp. — Length 4 mm.; ceph. 1.6 mm. long, L25 mm. 

 broad. Ce])halothorax red-brown, clothed with golden sc^Ues; legs red-brown, 

 except the pale tarsi ; tarsi, patella? and tibite ii. iii and iv, lined with pale yel- 

 lowish ; sternum and mouth-parts red-brown ; anterior coxje reddish, others pale. 

 Abdomen whitish, a broad red-brown stripe on each side, dorsum with scattered 

 golden scales and short black hairs; the cephalothorax is low and tlat, eye-region 

 one-third broader than lojig, slightly broader behind than in front, eyes of second 

 row nearer to lateral than dorsal eyes; first row straight, all nearly touching, the 

 diameter of lateral eyes is scarcely as great as radius of middle eyes ; mandibles 

 short and stout ; anterior coxai sejiarated by nearly width of lip ; sternum broadest 

 in middle, one-third longer than broad, blunt pointed. Legs quite short and 

 stout, first pair stoutest, but little longer than fourth pair, three pairs of spines 

 under tibia i, two pairs under metatarsus i; metatarsus iv spined only at tip. 

 Abdomen nearly once and two-thirds as long as broad, broadest a little before the 

 middle, moderately depressed ; the epigynum has a central piece nearly twice as 

 long as broad, outlined in front by a narrow oblique cavity each side, and behind 

 deeply excised in the middle. 



One female, Pnnta Gorda, Fla. (Mrs. A. T. Slosson). 



ACARINA. 



Troiiibidiuiu iiiarinus nov. sp. — Length 2 mm. Bright red; body 

 pyrifurm, l)iit not so large in front as in some species, a few depressions above; 

 eye-stalks short ; mandil)les slender. Legs short, anterior pair shorter than body, 

 posterior pair not reaching to tip of abdomen ; last joint of leg i slightly en- 

 larged, barely longer than the preceding joint. Body with short feathered hairs, 

 not so short, however, as in T. sericenm ; second joint of palpus quite long ; third 

 short, barely longer than broad ; claw quite long ; thumb longer than claw, clavate, 

 and with many fine hairs, longer than in T. sericenm. 



TRANS. AM. KNT. SOC. XXIII. (10) MAKCH, 1896. 



