314 Professor Aldricli on the 



dorsal bristles, is a more shining dark-blue area changing to violet 

 posteriorly, and also spreading wider, so that most of the posterior 

 half of the dorsum is deep violet. Viewing the specimen from 

 above and behind, the light striking it from above and in front, 

 four silver spots are visible — two just below the transverse suture, 

 and behind the humeri, the others above and behind the roots of 

 the wings. Scutellum bronze-green. Pleurse green, white-dusted, 

 tegulaa light-yellow, their cilia black. Abdomen bronze-green 

 above, brighter green on the sides, below the middle of the sides 

 white poUinose. Sixth segment entirely silvery pollinose, rather 

 thin dorsally. Hypopygium large, blackish-green, considerably 

 dusted, sessile, the lamellee developed into rather long upcurved 

 black processes, irregular in outline and with numerous black 

 bristles of different sizes ; at the base of each of these processes, 

 below (dorsad) is a minute, yellowish, yellow-haired appendix, 

 — this I take to be the true lamella, homologous with that 

 organ in Dolichopus, while the process just described is a develop- 

 ment from its upper basal corner, as occurs in some other species of 

 the family. Fore coxse yellow, at the base very slightly inf uscated, 

 with black hairs and bristles, middle and hind coxaj brownish-black, 

 rather largely yellow at apex. Femora and tibiae all yellow, the 

 middle and hiud knees very slightly infuscated, middle tibiae 

 slightly, the hind ones strongly infuscated at tip. Front tarsi 

 only slightly and gradually infuscated, middle ones from tip of 

 first joint, hind ones entirely, black. Wings brownish, the fourth 

 vein bent forward in a very gentle curve and afterward nearly 

 straight, ending close to the third before the apex. 



$ . Face wider, in the middle somewhat brownish ; palpi 

 larger. Front blackish-brown, silver spots on thorax smaller, 

 but still distinct. Abdomen somewhat coppery, often less bronze. 

 Hind tibiae less black at the tip. 



Length 35 mm. ; of wing, 3 mm. 



Eleven males and five females. May, September; one 

 specimen marked "Near sea by open stream." 



Pakaclius. 

 Bigot, Ann. Soc. Ent. Fr., 1859, p. 215. 



1. Paraclius filiferus, n. sp. (PL XI., fig. 102, tip 

 of wing.) 



(J. Front of medium width, white pollinose on a green back- 

 groimd. Palpi brownish-yellow, the extreme tips only visible, front 



