NATURAL SCIENCES OP PHILADELPHIA. 217 



This species is very much, like the European L. tripunctata Meig. 

 Still, judging from the description of the latter it seems to be different. 



6th Section. 



A supplementary cross-vein between the anal and axillary veins. Forceps of 

 (^holding the middle between those of Dicranomyia and of the 6th 

 section (L im n obi a vera.) See my figure of the forceps of the European 

 L. annulata L., (imperialis Liv.) in the Stett. Eutom. Zeit. 1854, 

 tab. i. f. 1, 2. 



The only species of this section is closely allied to some species of the 5th 

 section. 



L. argus Say, Long's Exped. App. p. 358 ; Wiedem. Auss. Zw. i. 33, 17. 



I hardly doubt of the identity of this species with the European L. annu- 

 lata Lin. (L. imperialis Loeio ; see the figure of the wing as given by 

 Prof. Loew in Lin. Entom. v. tab. ii. f. 15.) 



North Western Territory (Say), Nova Scotia (British Museum), Mass. (Mr. 

 Scudder), Me.^(Mr. Packard). I caught several specimens at Trenton Falls 



in June, 1858. 



DlCRANOPTYCHA nob. 



Antenna. 16-jointed, reaching the base of the wing in the (J 1 , and but little 

 shorter in the J; first joint cylindrical, elongated; second stout, obconical, the 

 four or five next oval, the following elongated; verticils moderately long. Eyes 

 naked, almost contiguous below. Proboscis short. Palpi short; second joint 

 short, stout, third a little longer, fourth not much longer than third. Feet long, 

 rather stout, pilose ; tibioz without spurs at tip; ungues smooth beneath ; pulvilli 

 distinct. Wings elongated, moderately broad, with one radial area; neuration 

 somewhat like Meig. I. tab. iv. f. 17; a discal and no petiolate areolet ; stig- 

 matical cross-vein apparent; mediastinal vein distinct, with the cross- vein near 

 its tip ; axillary vein short, with a distinct fold, having almost the appearance of a 

 supplementary vein, which runs from about the middle of the anal vein, down the anal 

 area, towards the posterior margin of the wing, but disappears just before reach- 

 ing it. 



$ forceps consists of two subcylindrical basal pieces, ending in two falciform 

 or unguiform horny appendages ; (6g. 12a shows the forceps ofD. nigripes; 

 fig. 13 one- half of that of D. s o b r i n a.) 



This genus is distinguished from L i m n o b i a nob. by the 16-jointed an- 

 tennas, the smooth ungues, the presence of distinct pulvilli and the structure of 

 the $ forceps, which approaches that of Limnophila nob. But it is sepa- 

 rated from the latter genus by having but one radial area. 



The peculiar fold in the anal area, mentioned among the generic characters, 

 exists in some other genera also ; but it is by far not so distinct and more 

 straight. Here, on the contrary, it is characteristic enough to have induced me 

 to derive from its presence the name of the genus. 



Dicranoptycha has one character in common with Antocha: it is 

 the peculiar iridescence of the wing, which, in both genera, seems to be due to 

 the great density and minuteness of the microscopic pubescence of the surface. 

 This iridescence is particularly apparent in D. germ an a, and less in the 

 two other species. 



D. germana. Fusco-fulva, alis fulvis, iridescentibus ; long. lin. 4 4. 



Head yellowish cinereous ; palpi brown ; antennae tawny toward the base, 

 darker towards the tip. Thorax brownish fulvous, posterior part of the prae- 

 seutum, the scutum, scutellura and metathorax with a cinereous tinge ; a line 

 of the same tinge al >ng the middle of the anterior part of the prrescutum. (This 

 tinge is generally more distinct in than in tf specimens) ; lower part of the 

 pleural with a hoary reflection ; halteres ochraceous ; feet ferruginous-tawny, 



1859.] 



