EEV. A. E. EATOX ON EECENT EPHEaCEEID.E OE MATELIES. 209 



as long as the tibia, and this nearly 1-J as long as the femur ; gradation of tarsal joints in 

 order of diminution 3 and 2 each suhequal to 4, 1, 5 ; the first scarcely more than A as 

 long as the second joint. Hind tarsus about f as long as the tibia, and this subequal in 

 length to the femur ; sequence of <3 tarsal joints 2, 5, 1, 3, 4 ; the first joint f as long 

 as the second. Ungues mutually alike in every tarsus, narro\y and uncinate. Hind 

 wings well developed, ovate-trilateral ; the dilatation of the marginal area moderately 

 obtuse in front ; the axillar region narrow, and with scanty neviration. In the $ sub- 

 imago the relative lengths of the abdominal segments counting from the 2nd to the 10th 

 may be formulated thus : — 5, 12, 12, 12, 15, 17, 11'5, 11-5, 9 ; segment 1 is thoracoid. 

 The pleurae of segments 7-9 are squarely truncate [7 appears to be branchiate in the 

 nymph] ; the ventral lobe of segment 9, acutely excised, has short acute points. Forceps 

 basis of c? angularly and widely emargiuate; forceps-limbs, as in Sq^hliiriis, 4<-jointe([, 

 with a short basal joint tuberculate on the inner side distally, and with a curved sub- 

 cylindrical second joint longer than the remainder. Penis-lobes narrow, somewhat like 

 those of Siiohlurus. Median caudal seta rudimentary, about ^ as long as the others, 

 which in 6 are about 1| as long as the body. Oculi apparently ascalaphoid, and conti- 

 guous above in the s ; anterior ocellus rather smaller than the others. Nymph 

 unknown. 



Type. M. anceps, sp. nov. (in ? Slphlurus, Etn. MS. 1883, in writing of PL XX.). 



Distrihtition. S. America. 



Etymology, jnernnwi'ioc, borne by the wind. 



Metamonius anceps, sp. nov. 



Siphlurus (?) anceps, ! Etn. MS., in the -writing of PI. XX. 34 b (wings & legs) . 



Snbimago (dried). — Wings light sepia-grey, with piceous or pitch-brown neuration ; in 

 some lights only, the longitudinal nervures appear light warm sepia-brown, and the cross 

 veinlets black ; cross veinlets narrowly edged with darker grey. Setee sepia-grey, with 

 dark joinings. * 



Imago {dried), c? . — Notum brown-ochreous. Alidomen in opaque view either light 



raw-umber, or else reddish brown ; segments 3-8 paler on each side from the base nearly 



to the terminal border ; in some examples the pale spaces in segments 3-6 are each 



obtusely triangular and translucent, and a dark triangle of the ground-colour occupies 



the hinder lateral angle below the space [but the pallor of these species may be partly 



due to Psocida:'], and the corresponding spaces in segments 7 and 8 are very pale 



yellowish ochre. Venter bordered laterally with very pale yellowish ochre, leaving in 



the midst a broad longitudinal dark burnt-umber or purplish brown stripe. Setse warm 



jepia-grey, with opaque joinings. Legs, in opaque view, light raw-umber ; the knee and 



dp of the tibia of the fore leg, and the knees and tarsal joinings of the hinder legs dark 



■aw-umber or bistre-brown. Wings vitreous, with the pterostigmatic region of the fore 



ving almost imperceptibly dusky ; neuration pitch-black, the cross veinlets in the ptero- 



tigmatic portion of the marginal area of the fore wing sparingly conjoined near the costa. 



iicugth of body 10-13 ; wing, d 13-14, $ 17 ; setae, 6 im. 17 & 2, subim. 10 & 2 mm. 



Sab. Chili (Reed, in M^Lach. Mus.). The adult ? is not represented. 



ECOND SERIES. — ZOOLOGY, VOL. III. 28 



