278 CATALOGUE OF 



Pedes lon^i, gracillimi ; femora postica basi subincrassata ; tibiae aiitica? 

 trispinosge ; tibiae inteimediae biseriatiin spinoste ; tibiae posticae trisevialira 

 spinosae. Alse auticae longae, angustae. 



Male. Body linear, very slender. Head convex above, nearly as 

 broad as tbe pr<»ihorax, willi a sli«;lit keel beiween tlie antennae, which are 

 approximate; front shining, erect. Eyes large, short-elliptical, very pro- 

 minent. Palpi slender ; apical joint very slightly thicker towards the tip. 

 Third joint of the maxillary palpi mnch longer than the fourth; fifth much 

 longer than the third. Antennae very slender, about twice the length of 

 the body. Prolhorax flat above, a little broader hindv\ard, with two slight 

 transverse furrows and with one slight longitudinal furrow ; lateral keels 

 slightly defined ; sides and hind border slightly rounded, the latter notched 

 on each side. Abdominal appendages very large; cerci cylindrical, very 

 long, incrassated at the base; two lony, slender, recurved appendages 

 beneath. Legs long, very slender; hind femora slightly incrassated towards 

 the base; fore tibise with a single row of three minute spines ; middle tibiae 

 with two rows of several minute spines; hind tibiae with three rows of 

 spines. Fore win^s very narrow, thickly reticulated, rather shorter than 

 the hind wings ; tympanum at the inner base of the right wing rather large. 

 Hind wings ample. 



The different structure of the protuberance bet\veen the anteniiEB 

 distinguishes this genus from Xiphidium. 



1. Letana linearis. 



Mas. Flava ; caput vertice plac/isqne quatuor nigricantibm aul 

 rufescenlibus ; aiitennce nigrcB ; prothorax vitta lata nigra aut rufa 

 nigro-marginata villisque duahiis bteralibus nigris ; abdomen vitia 

 nigra lata interrupla ; pedes testacei aut virides, nigra varii; alcB 

 anticce fusccB vitta coslali diuphana viridi venosa nigro-marginata ; 

 alee posticcB cinereo hyalina^nigricante venosce. 



Male. Yellow. Head with the disk of the vertex blackish or reddish, 

 and with two patches of the same hue on each side. Eyes livid. Antennae 

 black ; first joint partly yellow. Prolhorax with a broad black or red black- 

 bordered stripe in the middle, and with an irregular black stripe on each 

 side. Abdomen with a broad blackish stripe, which is more or less 

 interrupted on the hind border of each segment. Legs testaceous or green ; 

 femora with black tips; four anterior femora more or less speckled with 

 black; four anterior tibiae black, sometimes green ; hind tibise dark green 

 or black, sometimes with a whitish band near the base ; tarsi black or daik 

 green. Fore winys brown, with a pellucid costal strij)e in which the veins 

 are pale green ; this stripe is bordered with black on lis hind side towards 

 the base; tympanum of the right wing pellucid. Hind wings cinereous, 

 hyaline, iridescent; veins blackish. Length of the body 6 — 7 lines; 

 expansion of the fore wings 20 — 22 lines. 



a. North Hindostan. From Dr. Hooker's collection. 

 6, c. North Hindostan. From Capt. Reid's collection. 

 d. Mussoorie. Presented by Sir J. Hearsay. 



