7 



iL'li^l 



745. 

 PSYCHODA SEXPUNCTATA. 



Order Diptera. Fam. Tipulidae. 



Type of the Genus, Tipula phalsenoides, Linn. 



PsYCHODA Lat., Fab., Meig., Macq., Curt. — Trichoptera Meig. — 

 Tinearia Schell. — Bibio Genf. — Tipula Linn. 

 Antennae inserted between the eyes, in front of the face (2), not 

 approximating, nor longer than the thorax, slender, moniliform, 

 from 14 to 17-jointed, basal joint stout and more or less elongate, 

 2nd stout and globose or cup-shaped, the following globose no- 

 dules, connected by slender pedicles and surrounded by whorls of 

 hairs, or elongate-ovate, decreasing in size to the apex (3). 

 Labrum compressed, deeply channeled beneath. Hal. 

 MaxillcE? lying close to the labium, stout, compressed and 

 obtuse. Palpi rather large, incurved, attached to the apex of 

 the maxillae, pilose and 4-jointed, 2 basal joints robust, the 1st 

 ovate, 2nd rather longer, somewhat compressed, 3rd and 4th 

 more slender, clavate, latter the shortest (2*/). 

 Labium compressed, deeply channeled or cleft (g). Hal. 

 Head small, concealed under the thorax .• eyes large lunate, approxi- 

 mating on the crown (2) : ocelli none. Thorax gibbose (T), very 

 woolly, sometimes producing tufts of hairs in front, and occasionally 

 two biarticulate appendages (p). Abdomen rather short and thick, 

 often inflexed, with a long fascicle or pencil of hairs at the base. 

 Wings large (9), deflexed in repose and a little divaricating , ovate- 

 lanceolate, the apex pointed, with numerous longitudinal and 2 or 3 

 furcate but no transverse nervures, generally ciliated on both sides : 

 cilia dense and surrounding the wing, longest on the costa towards 

 the base, and on the posterior margin : halteres small and capitate. 

 Legs moderate, rather slender, more or less woolly : coxae short : 

 tibiae simple : tarsi not long, b-jointed, basal joint the longest, 4th 

 and 5th minute, as well as the claws. 

 Larvae living in dung ; long subfusiform, depressed, with a short tubu- 

 lar tail, and lateral spiracles. Bouche, j)l. 2. f. 20. Pupae with 2 

 appendages behind the head ; abdomen tapering : f. 22. 



Sexpunctata Curt. Guide, Gen. 1151, 10. 



Very pale ochreous-gray and downy: antennae 11 -jointed? 

 moniliform : eyes black : thorax pale ochreous : abdomen more 

 cinereous : wings slightly iridescent, some of the hairs black, 

 forming a pale fuscous fascia before the middle, across which 

 runs a horizontal <^ shaped mark, white in some lights, as well 

 as 6 or 7 spots along the margin at the apex of the nervures ; 

 3 on the costa bearing a black dot each, also 3 of the alternate 

 ones on the interior margin ; cilia pale fuscous : legs unspotted. 



The Psychodse are active little flies, which we see upon our 

 windows in April and May ; tliey are also found on walls, in 

 drains, on aquatic plants, in hedges, on the trunks of" trees, 

 &c., and sometimes they appear in prodigious quantities. My 

 iriend Mr. Hahday having transmitted to me his views re- 

 garding this singular genus, 1 shall give as ample an abstract 



