~y 
INSECTA. " 319 
Sepsis Fauu., Mutc. (Cephalia Mura.) Antenne shorter than 
head. Head elongate. Eyes rotund. Abdomen quadriannulate, 
narrow. Wings erect, vibrating. 
Sub-genera: Cheligaster Maca, N emopoda Roxin., Michogaster 
Maca. 
Diopsis 1. Eyes very remote, the head being produced on both 
sides into a transverse petiole, oculiferous at its apex, and before the 
apex antenniferous. Antenne short, with three joints, the last 
suborbicular with a long naked seta. Scutellum bispinose, two or 
four other spines at the sides of the thorax. 
Comp. A. Daut, preside C. Linnxo Bige Insectorum 1773, Amenitates 
Acad. vit, p. 303. Pl. vi. figs. 1—s (reprinted in Furssty, Archives de 
U Hist. des Ins. pp. 19, 20, Tab. 6); Dauman, Act. Holm. 1817, Analect. 
Entomol. No. 1. (OxEN’s Isis 1820) ; J. O. WESTWOOD, On Diopsis, Trans. 
Linn, Soe. xvitt. 1835, pp. 283—312, pl. See also figures of two species 
of this genus in GUERIN, Iconogr., Ins. pl. 103, figs. 8, 9. 
Linnaus described only one species of Diopsis (Diops. ichneumonea), 
now about twenty are known. They are all exotic and from the old world 
(west coast of Africa, India, J ava) ; Diopsis brevicornis Say, WIEDEM., a 
species from Pennsylvania, seems not to belong to this genus. According 
to WESTWooD there are four sete in the sucker in Diopsis Sykesii, as in 
Syrphus. These small flies by their pediculated eyes remind us of Podophthal- 
mus LATR., amongst the Crustacea, and of Zygena, amongst the fishes. 
Calobata Mric., Micropeza Larr. 
Micropeza Fau., Calobata Late. 
Tanypeza Fau., Teniaptera Macg., Nerius Fasr., WIEDEM. 
Longina Wieprm. Antenne longer than head, with first joint 
longest. 
Thyreophora Latr., Mera. 
Actora Mria. 
Coelopa MriG., (Psalidomyia DoumeEnc). 
Comp. DoumEro, Mém. sur le Psalydomyia fucicola, diptere vivant sur 
les bords de la mer, Ann. de la Soc. Entom. un. 1833, pp. 89—93. The 
male has at the abdomen a forceps almost like that of the Forjficule, but 
with obtuse and hairy points. 
Ulidia Metc., Mosillus Larr. 
Gymnopoda Macg., Lipara Metc., Timia Mute. 
