184) MANDIBULATA. TRICHOPTEEA. 



Genus XIX.— SERICOSTOMA, Latreille. 



Antenncs not so long as the wings, very stout, especially at the base, the basal 

 joint robust, slightly pilose : maxillary palpi in the males recurved, densely 

 hairy, the two united forming an obtuse rounded mask, concave within and 

 convex without, and furnished with a silky pile within; in the females 

 elongated, five-jointed, the terminal joint short and slender : head small, 

 with a tuft between the antennae : eyes large : thorax robust : wings narrow, 

 anterior without transverse nervures, somewhat obtusely rounded at the 

 apex ; posterior smaller, elliptic-ovate, slightly folded on the inner margin : 

 abdomen somewhat robust, obtuse : legs shortish, slender : tibia all armed 

 with a pair of spurs at the apex, the intermediate without a second pair 

 below the middle, and the hinder with a pair near the apex. Larva some- 

 what cylindric, with the head and following segment scaly above, the 

 remainder soft: legs short, pilose. 



At the time of the appearance of my Catalogue, I was not aware 

 that this genus had been named, as above, and characterised, by 

 Latreille,* and therefore I could not employ his name, but adopted 

 the very expressive one of Leach, from (ITpoo-wTrov, persona,) the 

 mask-like appearance of the male palpi, which had previously 

 suggested a similar name to Spence for the only indigenous species, 

 as referred to in my Catalogue. 



Sp. 1. Spencii. Plate xxxiii. f. 2. — Fusco-nigrum, alis anticis sericeo-testaceis, 

 aureo tinctis, antennis brunneis, basi punctoque verticis aurantiaco-ochraceis. 

 (Long. Corp. 4—5 lin. ; Exp. Alar. $ 10— ?14 lin.) 



Prosoponia Leachii. Steph. Catal. 319. No. 3627. — Pro. Spencii. Kirby and 

 Sp. Int. Ent. {ith edit. 1830) iii. 488.— Ser. Latreillii. Phil. Mag. (Curtis) 

 V. iv. p. 214. 



Brown-black : antennae reddish-brown, with some scale-like hairs at the base, 

 and a tuft on the crown orange-ochreous ; anterior wings testaceous-brown, 

 with a golden silky gloss ; femora dusky-brown ; tibise and tarsi ochreous, 

 the female has the antennae darker at their base, and the orange spot on the 

 crown is less conspicuous; the mask on the face is wanting. 



In my Catalogue I named this conspicuous insect after my lamented friend 

 Dr. Leach, whose brilliant career was suddenly obscured some years since, 

 and has now, alas ! within these few weeks been brought to a conclusion, 

 his death having occurred on the 24th of August last, at Genoa. In 

 Mr. Curtis's sketch of the undescribed species of May-flies, &c. he has 



* In Fam. Nat. p. 439. 



