342 SUPPLEMENT. 



One male, one female ; the male somewhat immature. There is a notable shortening 

 of the fore tarsus in this species, which is a good character : in the male its length is 

 five-sixths, in the female only three-fifths, that of the tibia ; this is very remarkable 

 for a female. On the Plate this insect is referred to the genus Pcecilobothrus, an error 

 immediately discovered as soon as I was able to see European specimens of the latter. 



PHYLARCHUS, gen. nov.* 



Face broad, narrowest at the points of insertion of the palpi, concave above and convex below, like that of 

 Pelastoneurus. Antennae small ; first joint hairy above, ending in a delicate oblique prolongation on the 

 inner side below ; second joint of moderate size, not prolonged on the inner side of the third in a thumb- 

 like manner, but only with a rounding outline ; third joint rounded, of medium size, with short plumose 

 arista. Palpi small, pointed. Thorax destitute of acrostichal bristles, hinder part not concave or 

 ss j- r flattened ; scutellum with one pair of stout bristles and several delicate pale hairs on the edge. Abdomen 



1 . rather short, not compressed, with five visible segments. Legs with comparatively few bristles, the 



K^ \> femora all bearing some rather prominent hairs on the underside beyond the middle; hind metatarsus 



\ ~> only a little shorter than the following joint ; hind coxae with one bristle and a hair on the outer side. 



?/ ^ V j" ' Venation as figured (fig. 16) : fourth vein straight in its last section ; third vein converging very slightly, 

 f K' almost parallel; posterior cross- vein distant its own length from the margin on the fifth vein; first vein 



v reaching only a little over one-third of the length of the wing. 



/! ,}f '-'' Related to Diostracus. The characters are taken from the female only, the male not 

 '•-> * J' being represented in the collection before me. 



1. Phylarchus tripartitus, sp. n. (Tab. VI. fig. 16, wing of $ .) 



$ . Face and front pure brown down the middle, with a narrow white stripe on each side, which becomes 

 J bluish above : it extends down over the bulging occiput, becoming gradually wider, so as to bring the 



brown collar to a point above the neck. Antennae red, the upper edge black ; arista black, short, plumose, 

 inserted near the base. Cilia of inferior orbit black. Palpi covered with white dust. Thorax bluish-white 

 or glaucous above, with a sharply-defined median brown stripe, occupying all the space between the dorsal 

 bristles, or about one-third of the width ; the outer edges of this brown stripe become purplish, and the 

 same colour shows on the sides of the front near the vertex ; from the humerus to the root of the wing 

 there is a darker brown stripe, on the upper edge of which are three round black dots of considerable 

 size ; pleurae black, covered with glaucous dust, which extends down over the coxae. Tegulas yellow, their 

 cilia black ; halteres yellow, the large knob black. Abdomen rather dark greenish-bronze, on the sides 

 with patches of glaucous dust. Legs yellow, the extreme base of the fore coxae infuscated ; all the tibiae 

 very slightly infuscated, and the extreme tips of the hind femora narrowly blackened ; tarsi infuscated 

 from the base. Wings infuscated ; veins black and rather heavy. 

 Length 3 millim. 



Hab. Mexico, Vera Cruz (H. H. Smith). 



Two females. 



SYNTORMON. 



Syntormon,Ijoew, Neue Beitr. v. p. 35 (1857); Wheeler, Proc. Calif. Acad. Sci. (3) ii. p. 36 (1899). 



1. Syntormon quadratus, sp. n. (Tab. VI. figg. 18, wing, IS a, antenna, 6 .) 



3 . Pace and front black, with thin brownish dust, the former wide, but narrowing a little towards the mouth. 

 Antennae wholly black, the first joint strikingly elongated, swollen towards the tip, about the length of 

 the remaining two, entirely bare ; second joint of the usual form, projecting forward on the inner side of 



* <pv\apxos, the head of a tribe. 



