154 C. R. Osten Sachen'. 



vein connects the first vein, a short distance back of the tip, with 

 the Costa; this crossvein, together with the anterior branch of the 

 second vein, form near the anterior margin a small rhomboid^) cell, 

 very characteristic of the Tipulidae. It is absent in DolicJiopeza 

 and some related genera, becäuse the branch of the second vein is 

 wanting. 



3. In the structure of the discal cell and the direction of the 

 veins surrounding it. The vein separating the two posterior cells 

 (Loew's posterior intercalary vein) issues very near the inner end 

 of the discal cell, usually from the angle between this cell and the 

 great crossvein; this, in most cases gives the discal cell a pentagonal 

 shape, unless, as for instance in Pacliyrrliina, the vein has no con- 

 tact at all with the cell, and has the appearance of a direct Prolon- 

 gation of the fourth longitudinal vein; in such cases the discal cell 

 is a parallelogram. 



4. ^A distinct fold generally runs, in the Tip. longipalpi, 

 across the wing from the inner end of the pterostigma, over.the discal 

 cell, to the penultimate posterior cell; it is rnore or less distinct in 

 different genera. 



5. The rostrum is usually more prolonged, than in T. brevi- 

 palpi, and its upper part has a characterisjtic projecting point, 

 called n a s u s ; it is very seldom wanting , and usually bears a tuft 

 of hair. 



6. The antemiae in the normal types of the T. longipalpi are 

 13-jointed (those of the Tip. brevipalpi are 14 — 16 jointed). 



7. The male forceps of the longipalpi is generally more volu- 

 minous and of a more complicated structure than that of the brevi- 

 palpi. 



8. In size, the longipalpi are generally larger and more 

 strongly built; the legs, and especially the tarsi, are longer. 



9. That the longipalpi keep the wings divaricate in repose, 

 while the brevipalpi fold them is generally true, but suffers good 

 many exceptions: Pedicia, although brevipalpous, keeps the wings 

 divaricate, while the longipalpous Pachyrrhinae, as well as many 

 Tipulae, especially those with marmorate wings {T. irrorata, hor- 

 tensis, scripta etc.) keep the wings folded in repose.' (Compare 

 V. d. Wulp, Handel. Ned. Ent. Ver. I. D., 1 St. 1854.) 



') In Monogr. etc. Vol. IV. I called it trapezoidal cell; 

 rhomboid is better. 



