PACHYKRHINA. 17 



3. Pachyrrhina consularis, sp. n., $ . 



Pachyrhina (Tipula) elegans (Wiedem. ?, non Fabr. !), Schiner, Eeise d. Novara, Zool. iii. Abth. i. 

 p. 34 \ 

 Head, including the rostrum, pale orange-yellow ; the latter with a brown mark (almost obsolete in some 

 specimens) on the upper side ; a broad, deep black, shining spot on the vertex, the point of which is a little 

 less than a right angle, and not drawn out in a stripe ; a small dark brown mark on the inner orbit of each 

 eye ; antennae yellowish, darker towards the tip, the second joint and the bases of the joints beyond the fourth 

 slightly infuscated ; palpi yellowish, brownish towards the tip. Thorax yellow, with uniformly deep black, 

 shining stripes ; the lateral ones strongly curved towards the dorso-pleural suture, their tip being velvety- 

 black and opaque ; collar yellow in the middle, black on the sides; scutellum black; metanotum yellow, 

 with a black stripe in the middle triangularly expanding towards the posterior margin ; on the pleura 

 the following black or dark brown spots are visible : a large one, above the sterno-pleural suture, occupies 

 the lower half of the mesopleura, its upper angle pointing towards the root of the wing; an elongated one 

 along the mesopleural suture ; one between the front and middle coxae, and another between the middle and 

 hind coxae ; a large horseshoe-shaped spot running round the yellow metapleura, and having the haltere 

 inserted on its posterior end. Abdomen yellow, segments 1-6 with black posterior margins ; on the first 

 segment the margin is rather narrow and of nearly equal breadth ; on the other segments the margins, 

 narrow on the sides, expand in the middle, so as to reach a little beyond the distal half of the segment 

 (except on the second segment, which is larger) ; on all the segments the stripes reach the lateral margins ; 

 the seventh segment has only a narrow blackish edge. Ovipositor ferruginous. Halteres brownish-yellow. 

 Coxae and femora yellow, the extreme tips of the latter brownish ; tibiee yellowish-brown ; tarsi brownish. 

 Wings with a yellowish tinge on the antero-proximal half, and especially in the costal cells ; stigma pale 

 brown ; contact of the second posterior cell very narrow, sometimes punctiform. 



Length ( $ ) 11-13 millim. (without ovip.). 



Hdb. Costa Rica, Cache {'Rogers) ; Nicaragua, Chontales (Janson). — Venezuela l . 

 Four females. 



N.B. — Schiner's specimens (from Venezuela), which I have compared in Vienna, 

 certainly belong to the same species, although they show some differences ; the black 

 on the abdomen leaves only narrow yellow anterior margins on the segments, and the 

 halteres have more distinctly yellow knobs. That these specimens are the Tipula elegans 

 of Fabricius seems more than doubtful : " Antennae nigrse, articulo primo flavo ; abdo- 

 men, ano nigro," &c, does not agree at all. Moreover, Wiedemann, in interpreting 

 this description, confuses P. crocata with P. cornicina. Fabricius means the former, 

 and hence describes the thorax as black with yellow lines ; the inconsistency which 

 Wiedemann discovers in the description arises from the fact that for crocata he reads 

 cornicina. P. consularis cannot be compared to P. crocata. 



P. consularis has also something of P. mexicana, Macq. Dipt. Ex. Suppl. i. p. 12, but 

 cannot be identified with it. 



4. Pachyrrhina usta, sp. n., <$ ? . 



Head orange-coloured above, with a large arrow-shaped shining black spot on the vertex (the point of which 

 is prolonged in the shape of a line over the front), and some black marks on the inner orbits of the eyes; 

 rostrum shining black above, yellowish below. Antennae black, the basal joints more or less yellowish- 

 brown. The prevailing colour of the thorax is black; narrow yellow lines, expanding on the humeri 

 separate the usual thoracic stripes, which are deep black, and shining ; the lateral ones incurved towards the 

 dorso-pleural suture, without any opaque spot at the tip ; collar bright yellow in the middle only ; a yellow 

 spot in front of the thoracic suture, inside of the curvature of the thoracic stripe ; a couple of small yellow 

 marks near the root of the wing ; an elongated yellow spot in front of the haltere ; otherwise the pleura 

 BIOL. CENTE.-AMER., Dipt., July 1886. d 



