DIPTERA. 



rather than at the anterior part of the head, so that the eyes are 

 always separated below in consequence of its interposition. Ocelli 

 seldom wanting. The flagellum of the antenna more compact., some- 

 times in one piece (never having more than 8 joints in our native 

 kinds), usually terminating in (one to three) abruptly slighter joints. 

 Palpi short, projecting above the proboscis, or lying on it, appearing 

 externally inarticulated, the first joints, if there be any such distinct, 

 being short. The veining of the wings is more easily reducible to one 

 type than in Nemocera* The anal areolet is closed, often at a distance 

 from the margin, or if it reaches this, it is tapered nearly to a point : 

 rarely it disappears with the anal vein. The inner or scutellar alulae 

 are often developed, sometimes so as to conceal the halteres. The 

 ungues are not toothed. The empodium is usually more slender than 

 the onychia. 



HYPOCERA, Macq. = Trineurae, Latr. 



Antennae prope epistoma, articulo uno insiguiore et arista. 



Mandibulae et maxillae obsoletae. 



Palpi porrecti, exarticulati. 



Alae venis anterioribus validis, cum costale, circa medium costae desi- 



nentibus ; posterioribus subtilissimis, simplicibus, disjunctis. 

 Coxae et femora crassa, compressa. 



EPROBOSCIDEA. 



Omaloptera, Leach. 

 Pupipara, Latr. 

 Homaloptera, Steph. ; Curtis. 



Antennae foveolis immersae prope os. 



Labium tubulosum, superne fissum, basi inflatum, lingua tenui inclusa 



et labro incumbente inter palpos porrectos fere vaginatum. 

 Pedes dissiti sterno lato. 

 Abdomen coriaceum, vix insectum. 

 Alae et halteres saepius mutila vel nulla. 

 Ungues duplicati, vel triplicati. 



Add. Palpi extra fulcrum labii siti, nee cum eo exserendi. Oculi 

 multiformes. Prosternum ultra capitis insertionem porrectum. Thorax 

 depressus. Ala3 ubi completse fere ut in Brachyceris. Abdomen basi 

 constrictum. Ungues et onychia imparia, utraque ex adverso, i. e. unguis 

 major arolium minus subjectum habet et vice versa. Ungues ad scan- 

 sum apti. 



* The veins which run to the hind margin chiefly originate from an intermediate 

 axis, which divides into three branches near the root of the wing, and these are 

 usually again subdivided, and connected by deflexion or by transverse veins. 



