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Show 53 maxillae and tarsus of the fore of similar are a the bases of on basal in leg fringes are structure the fore coxae; on of each of of corners femur, tibia, and long spine-like hairs; the gills 1-7, each pair segments filamentous portion covered the posterolateral the on by abdominal dorsal a consists plate-like portion; segments 8-9 end in long sharp spines. Distribution Palearctic Orintal and and Honduras to in Nearctic, extending in the the to Sunda Islands the in Neotropical Region. ) Central American ecords One species of Isonychia has been reported from this Isonychia ection contains ently the in sicca Walsh has same new a been found in species as a male The writer's Mexico. species of Isonychia. collected reared female A Mexico in area. by R. Bo coll- is appar- Selander 1955. Isonchia Male Lmago Length 151mm. , parnota Tails n. spo 30-31 mm, Fore wing 13-14 mm. yellow Head, thorax and abdomen yellowish brown; eyes grayish; ish; wing bases purplish; first pair of legs yellowish brown, washed with reddish brown, especially towards the base of femur and tibia; the apex of each tarsal segment washed with reddish brown; the second and third pairs of legs pale; last tarsal segment somewhat reddish brown; ings hyaline, but washed' with brown in the costal antennae and bey<;>;? ';liRcosF.: acesbetween bulla in the space the bu l l a ; r. l anq R2; anterior 'portion cloud brown veLns and jut beow crossveLns lLght the brown the wibg .d_4;rker. veins each ,tergum darker brown; df the with brown Abdomen yellowish apex marks on leural margin of trga; abdominal sterna brown with Cross in the of diagonal drker V-shaped marks on segmnts'2-4, these marks bt=1coming parallel matks on eah segment, becoing'more pronouriced in, the last fcur seg with merit s ; cerci yellowish at bas e Female. imago. Length; , 18- 1. 9 tyhite ap t ca l Ly mm, 'Fore , wing 16:- 17 mm. Head pale, |
