1878.] 6 17 [LeConte. 
11. Prothorax with margin not explanate............. DA CIStROOE CODE 12. 
Prothorax as wide as the elytra, strongly punctured, sides narrowly 
DUtsStromelysce xpla wee sais sielctetereyatolsl ete wih ah sls = lore 12. marginata, n. sp. 
12. Prothorax wide, strongly punctured, much rounded on the sides, which 
are motwexplana temas.) ose ett EO OMO DEOL DHS SoU Ope 13. binotata. 
Prothorax slightly narrower than the elytra, strongly punctured, sides 
MO He MplamMAles i ravers tvcremen = Seer oale ayale stereos eapelateres 14. longula, n. sp. 
In the Munich Catalogue Mycetophila Gyll. (1810), which antedates My- 
cetochares Latr. (1825), is adopted for this genus ; the former name was, 
however, pre-occupied by Meigen (1803), for a genus of Diptera, as is very 
properly mentioned by Lacordaire (Gen. Col. V., 507, note). 
M. basillaris (Say) remains unknown. When found, it will be easily 
recognized by the scarcely punctured prothorax, with three posterior im- 
pressions, and the striate elytra having an oblique red spot like the species 
o—) of the table. 
50. Mycetochares pubipennis. Dark brown, shining, rather 
densely clothed, especially on the elytra, with long brown pubescence. 
Head punctured, eyes more transverse and less prominent than in the other 
species; antenne paler brown, rather stout, about half as long as the body. 
Prothorax one-half wider than long, scarcely narrowed in front, not dense- 
ly nor strongly punctured, broadly longitudinally impressed at the middle 
of the base, and obliquely near the hind angles; sides moderately rounded, 
not explanate, base not margined. LElytra not wider than the prothorax, 
punctured ; strize punctured not impressed, nearly obliterated at the sides 
and behind. Beneath punctulate and finely pubescent, legs piceo-rufous ; 
prosternum extremely narrow between the front cox. Length 4.8 mm. ; 
.19 inch. ? 
California, at Tejon and San Diego. Easily known by the 
more transverse and scarcely prominent eyes, and very nar- 
row prosternum. 
51. Mycetochares laticollis. Elongate-oval, not convex, above 
black, shining, elytra each with an oblique red spot near the base ; sparsely 
pubescent. Head and prothorax sparsely punctulate, the latter fully twice 
as wide as long, widest at the middle, very much rounded on the sides, 
which are slightly explanate near the hind angles ; base extremely finely 
margined, with three broad shallow impressions, of which the middle one 
is nearly obsolete. Elytraa little narrower than the prothorax, not densely 
punctured, with very faint traces of strive near the suture. Antenne rather 
stout, under surface and legs testaceous-red ; palpi and large gular spot 
yellow. Length 6.3 mm.; .25 inch. 
Pennsylvania; under bark ot Populus dilatata in June ; 
one specimen, Prof. 8. 8S. Haldeman. I confounded this 
species formerly with M. fraterna, from which it differs by 
PROC. AMER. PHILOS. SOC. XviI. 101. 8Y. PRINTED JUNE 11, 1878. 
