6 S. \V. \V1L1,IS'I'().\. M. 1). 



the third joint; fifth joint, or secon^ joint, of the .style, longer than the entire 

 length of the preceding, narrowed, almost pedicellate at the base, flattened beyond 

 the tip of the lobes of the preceding joint, and then obtusely pointed, somewhat 

 irregular in shape and shallowly sulcate, clothed with very fine short pile. 



Thorav convex, nearly bare, wholly without macrochaetae except a few very 

 short intra-alar ones. Legs rather stout, without macrochaetae except a few short 

 ones at the tips of tibiae and the basal tarsal joints. Wings as in C'eraturgus 

 cruciatus, but broader, marginal and first posterior cells open ; th^ posterior inter- 

 calary vein arises from the posterior basal transverse vein a short distance from 

 the base of the discal cell. In M. vielas the type and M. rufiis (new sp.) the 

 ^ourth posterior cell is broadly open, in M. lobicornis closed and petiolate. An- 

 terior cross-vein near middle of the discal cell. 



Abdomen in structure rather like that of Dioctria, sliorter than the wings, the 

 sides nearly pai'allel, or gently concave, to the tip of the fifth segment in the male, 

 in the female the fifth segment gently n,arrowed behind: a little narrower than 

 the thorax in the male, in the female about as wide: flattened, so that transverse- 

 ly it is only gently convex above, gently grooved at the incisures, each segment 

 being gently convex longitudinally ; smooth, nearly bare, except sparse very short 

 pile; segments of nearly equal length, the sixth a little shorter, the seventh very 

 short. Hypopygium small. 



, This description is drawn from a male of M. mela.s and a female M. 

 nifm which agree closely in structure. In M. lohicornis the antennal pro- 

 tuberance is more obtuse, and the face more flattened, in profile very 

 narrow, and the prominence near the, middle wholly wanting. The 

 fourth posterior cell is also closed a little before the margin of the wing, 

 and the first posterior cell strongly coarctate. 



From the diagnosis of this genus given by Mr. Bigot, there are some 

 dift'erences, which might render the recognition doubtful. The antennae 

 are not as long as the head and thorax combined, but considerably shorter, 

 and the third joint is at least a half longer than the first; the third 

 joint has two processes like the fourth joint. There are but two joints 

 in the style, as in Ceraturffus. From the irregular shape of the last 

 joint, it might be thought to be divided, but such is not the case. Three 

 joints in the style would be anomalous I think. 



1. JTIyelaphus nielafs. 



? Mi/elaphus vielas Bigot, 1. c. 



■J, .—Black, abdomen shining; halteres and pulvilli yellow; wings black, more 

 dilute behind and at the tip. Length, 14^ mm. Face smooth, shining, bare, in 

 the middle on the tubercle broadly and indefinitely pitchy red; bristles on the 

 oral margin yellowish white with one or two black ones on the sides ; beard short, 

 sparse, black. Front on the sides near the eye with a few short black bristles. 

 Antennae wholly black; on the upper sides of the first and second joints, with a 

 few short black hairs. Thorax deep shining black, above with a blue reflection, 

 the dorsum wholly without markings, but covered with very short sparse black 

 hairs ; a minute spot on the humeri red, and the post-alar callosities pitchy black. 

 Pleurae very smooth, shining, except on the upper part of the sternopleurae. 



