LONGS SECOND EXPEDITION. 243 



A very common little insect, even in Philadelphia. It may 

 be readily distinguished from other species by its move acute 

 wings, as well as by the arrangement of the spots and bands, 

 however obsolete, which exist on these organs. 



LIMNOBIA Meig. 



L. ARGUS. — Yellowish-white ; head black ; wings ocellate and 

 marbled with blackish. 



Inhabits North-west Territory. 



Antennae moniliform ; thorax pale yellow-piceous, whitish near 

 the neck ; wings hyaline, with a double series of large, pupilate 

 ocellae, those near the tip confused ; ultimate nervure furcate ; 

 poisers fuscous, at tip white; eoxse whitish; thighs annulate 

 with black near the tip. 



Length i 9 more than three-tenths of an inch. '[359] 



To this species the name of ocellata would perhaps be more 

 appropriate than it is to the Linnsean species of that name, inas- 

 much as in the latter the ocellse are epupilate. It is a very 

 pretty insect, and exhibits much singularity in the arrangement 

 of the nervures of its wings, the penultimate and ultimate ner- 

 vures being connected by a transverse nervure which arises from 

 the tip of the latter. In other respects the distribution of the 

 nervures are similar to that of the bifasciata Fabr. Wied. 



[This is identical with the European L. annulata Linn. 

 (L. imperialis Loew ; conf. Linn. Ent. 5, tab. 2, tig. 15). — 

 Sacken.] 



TIPULA Linn. Meig. 



T. MACULA tipennis. — Cinereous ; thighs black at tip, wings 

 dusky with white spots. 



Inhabits North-west Territory. 



Antennae yellowish, incisures of the joints dusky; palpi black- 

 ish; thorax with two brown, dorsal lines, which are confluent on 

 the anterior margin, attenuated behind, and abbreviated behind 

 the middle; a lateral line slightly interrupted in its midd! 

 hardly reaching the anterior or posterior margins; scutel dull 

 honey-yellow, with a black line; wings dusky, with a black 

 carpal spot margined with white, three or four white spots along 

 the central nervure, and about as many near the termination ol 

 the ultimate nervure; poisers white, dusky at tip; abdomen 



