68 MANDIBULATA. KEUROPTEKA. 



This genus differs from the preceding one by possessing one pair 

 of wings only (the anterior), and from the other two genera of this 

 family by having two filaments only at the apex of the abdomen ; the 

 wings are generally furnished with but few transverse nervures, and 

 are mostly of very delicate structure, and the insects are usually of 

 pale yellowish or ochreous tints. 



Sp. 1. dipteriim. Plate xxix. ^. 3. — Pallide I'ltfescente-griseum, segmentoruni 

 viarginibusj-uscescentibus, alts hyalini's, costajlavescente-brunned, albo marino-' 

 rata, setis J'usco pundatis. (Exp. Alar. 8 — lOliu. ; Long. corp. 3i — 4 lin.; 

 1. set. 6—7 lin.) 



Eph. diptera. Liiud.—Cl. dipterum. Sieph. Catal. 306. No. 3402. 



Pale reddish griseous : the edges of the abdominal segments brownish, fila- 

 ments as long again as the insect, closely dotted with fuscous ; legs pale 

 ochreous, anterior femora lurid ; wings hyaline, faintly tinged with yellowish, 

 costa broadly brownish yellow, marbled with irregular white dots. 



Pseudimago ashy-ochreous, with the wings fuscescent and ciliated, the costa 

 dusky. 

 Abundant throughout the metropolitan district from the end of 



May, and at intervals during the summer : it is, for an insect of this 



family, tenacious of life, as I have twice kept individuals alive above 



three weeks. 



Sp. 2. ochraceum. Pallide ritfo-ochraceum, pedibus pallidioribus, alls kyalinis 



costa concolore, setis pallidis fusco subpunctatis. (Exp. Alar. 6 lin. ; Long. 



corp. 3 lin.; 1. set. 2 lin.) 

 CI. ochraceum. Staph. Catal. 307. No. 3403. 

 Pale reddish-ochreous : eyes dusky ; legs very pale ochreous ; filaments pale, 



very faintly, but closely, dotted with pale fuscous ; wings hyaline, costa 



concolorous. 



Taken near Hertford, in June. 



Sp. 3. hyalinatum. Incarnatum, pedibus pallidioribus, alis hyalinis, nervuris 

 obsoletissimis. (Exp. Alar. 5^— 6§ lin.; Long. corp. 2^—3i lin.; 1. set. 

 3k lin.) 



CI. hyalinatum. Sfeph. Catal. 307. N'o. 3405. 



Pale flesh-colour : thorax with two fainter lines ; legs pale flesh-colour ; fila- 

 ments as long as the insect, whitish, with a tint of red, and faintly dotted 

 with fuscous ; wings long and narrow, very clear and transparent, colourless ; 

 nervures extremely faint. 



Pseudimago pale ochreous, with the wings above brownish-yellow. 



Not uncommon throughout the metropolitan district ; also found 

 near Dover and in Devonshire, in June and the beginning of July. 



