BITTACOMORPHA. 315 



beyond the fifth ; the two basal cells do not reach much beyond 

 the middle of the wing (Tab. II, fig. 20). 



The peculiar membranaceous, spatulate, ciliated appendage, 

 inserted at the foot of the halteres, and observable in Ptychop- 

 tera, exists also in Bittacomorpha. 



The relationship of Bittacomorpha and Ptyclioptera is very 

 great and evident, all the difference of the outward appearance 

 notwithstanding. A rather large, transverse head, closely applied 

 to the thorax, a pointed epistoma, long palpi, large lips, a small 

 antennal scapus, a sinuate thoracic suture, an almost obsolete 

 collare, a large metathorax, the spatulate appendage, are charac- 

 ters common to both genera. The male forceps of both have a 

 similar structure ; the venation is almost the same ; if we suppress 

 the fork, inclosing the second posterior cell of Ptyclioptera, we 

 obtain the venation of Bittacomorpha. 



The only known species of the genus, B. clavipes, was first 

 described by Fabricius, as Ptyclioptera clavipes, in 1781. Mr. 

 TTestwood erected the genus Bittacomorpha for it (Lond. and 

 Ediiib. PJiilos. Mag. 1835, p. 281). It has been found in North 

 America only. 



The name is derived from Bittacus, a neuropterous insect, 

 and poptyrj, shape, on account of a slight resemblance between 

 the two genera. 



Description of the species. 



1. B. Clavipes Fab. % and 9 • — ^igra, mesonoti vitta, metathorace, 

 pleurisque albis ; pedibus albofasciatis. 



Black, a stripe on the mesonotum, tbe metathorax and the pleurae white ; 

 feet banded with white. Long. corp. 0.55. 



Syn. Tipula clavipes Fabricius, Spec. Insect. II, 404, 19 ; Mantissa Ins. II, 



323, 21 ; Ent. Syst. IV, 239, 25. 

 Ptychoptera clavipes Fabricius, Syst. Antl. 22,4. — Wiedemann, Auss. 



Zweifl. I, p. 59. 

 Bittacomorpha clavipes "Westwood, Lond. and Edinb. Philos. Mag. 



1835, p. 281. 



Head silvery white in front, vertex black on both sides ; pro- 

 boscis, palpi, and antennae brownish-black ; thorax velvet black 

 above, with a white longitudinal line in the middle of the meso- 

 notum ; pleurae silvery white, sericeous ; metathorax likewise ; 

 scutellum yellowish ; halteres with a brownish knob ; femora 



