ERIOPTERINA. 137 



Besides the characters of the Eriopterina which have already 

 been enumerated, there is one which deserves to be mentioned 

 here. In ttiis group of Tipulidse the anterior branch of the 

 fourth longitudinal vein is quite frequently forked, while the 

 posterior branch is simple, and thus, when the discal cell is open, 

 it coalesces with the third and not with the second posterior cell. 

 We find this structure in two Xorth American Eriopterse (E. 

 caloptera Say, and parva 0. S.), three North American and 

 several European Rhyjjliolophus ; in all the Goniomyide, which 

 have no discal cell, and in the European Psiloconopa lateralis 

 Macq. (Jlavolivibafa Hal.). Among the other Tipulidse this 

 structure is rare (compare the Introduction, page 33). 



I am not aware that any genus of Eriojjterina, foreign to 

 Europe and North America, has been published, unless Lachnocera 

 Phili ppi (Fer/i. Zool. Bat. Ges. in Wien, 1865, p. 615, Tab. XXIII, 

 fig. 5), from Chile, belongs here. The venation of this genus is not 

 unlike that of Goniomyia ; it also reminds of a Lininophila with 

 four posterior cells. The statements of the author are not com- 

 plete enough to admit of any certain conclusion. The translation 

 of the description is given in the Appendix. 



The following new genus, from Mexico, is in Mr. Bellardi's 

 collection, in Turin : — 



Sigmatomera, nov. gen. (from oiyna,, the letter s, and /itpoj, 

 part). 



Two submarginal cells, four posterior cells, and a discal cell ; the tip 

 of the auxiliary vein is not much beyond the basis of the second sub- 

 marginal cell ; the subcostal cross-vein is at a moderate distance from 

 this tip ; tibiae without apparent spurs ; empodia small ; antennse ( ^ ) 

 16-jointed, more than once and a half the length of the head and the 

 thorax taken together; joints subreniform, nodose ; eyes [% ) very large, 

 convex, almost contigTious on the upper as well as on the under side 

 of the head. * 



The very large^ convex, apparently bare eyes, come almost in 

 contact on the front ; they are separated by a small triangle above 

 the antennjB, and by a very narrow, linear space above this 

 triangle. The rostrum is rather short, and shows the general 

 structure of the Limnophilina — two stout lips being visible 

 below the oblong epistoma. The palpi are of moderate length, 

 and the last joint is more prolonged than is generally the case 

 among the Limnophilina. The antennts remind of those of 



