278 CATALOGUE OF 



Pedes longi, gracillimi; femora posiica basi subincrassata ; tibiae anticae 

 trispinosae ; tibiae intermedia? biseriatim spinosae ;| tibiae posticae triseriatim 

 spinosae. Alae anticae longae, angustae. 



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

 broad as the proihorax, with a slight keel between the 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 much longer than the fourth; tilth much 

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

 the body. Proihorax flat above, a little broader hindward, with two slight 

 transverse furrows and with one slight longitudinal furrow ; lateral keels 

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

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

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

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

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

 with two rows of several minute spines; hind tibia? with three rows of 

 spines. Fore wings very narrow, thickly reticulated, rather shorter than 

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

 Hind wiugs ample. 



The different structure of the protuberance between the antennae 

 distinguishes this genus from Xiphidium. 



1. LETANA LINEARIS. 



Mas. Flava ; caput vertice plagisque qualuor nigricantibus aul 

 rufescentibus ; anlennce nigrae ; prothoro.x villa lala nigra aut rufa 

 nigro-marginata vitlisque duabus lateralibus nigris ; abdomen villa 

 nigra lala inlerrupla ; pedes testacei aut virides, nigro varii; alee 

 anlicce fuscce villa coslali diaphana viridi venosa nigro-marginata ; 

 aloe postica 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. Antennas 

 black ; first joint partly yellow. Prothorax 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 lips; four anterior femora more or less speckled with 

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

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

 green. Fore wings brown, with a pellucid costal stripe in which the veins 

 are pale green ; this stripe is bordered with black on its 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. 



