246 NEW YORK STATE MUSEUM 



ii Sc longer, considerabl}- surpassing the base of Rs ; cross 



vejn r present Empeda 



Iili R2 longer than the fused portion of i?2+3 



/ Rs greatly shortened and angulate at its first fork, forming 

 a V-shaped support for the front end of the 



cord Cryptolabis 



ii Rs normal 



y Second fork of Rs shifted to the posterior 



side Molophilus 



jj Second fork of sector, anterior and normal in position 

 k A supernumerary cross vein present in the cell R2; sd 



A strongly bisinuate Helobia 



kk No supernumerary cross vein in cell Ri; 2d A 

 not strongly bisinuate 

 / The tips of the cubital vein showing a tendency to 

 turn toward the apex of the wing 

 VI Cross vein m present, and situate nearer to the 

 wing margin than to the fork of M, inclosing 

 an unusually long cell ist M2 

 n Outer border of cell ist M2 sinuate. .Acyphona 

 nn Outer border of cell ist Mi broken by a re- 

 entrant angle from which springs a spur or a 



cross vein Haplobasis 



vuii Either the base of Mz or the cross vein M 

 absent, leaving the cell ist Ah open ex- 

 ternally 

 n The cross vein vi absent ; anal veins conver- 

 gent toward their tips Erioptera 



nn Base of Mz absent, its tip transferred to 

 the support of cross vein i)i ; anal veins not 



convergent at their tips Mesocyphona 



// The tips of the cubital vein in their normal posi- 

 tion, turned away from the wing apex 

 VI The sides of cell ist M- parallel : the tip of R2 

 more or less decurved 



11 The first fork of Rs skewed forward 



Gnophomyia 



nil The first fork Rs symmetrical 



Limnophila in part and Ulomorpha 

 linn The sides of cell ist M2 more or less divergent 

 to its outer end ; tip of R2 straight, or slightly 

 recurved 

 n The deflected base of Cui meets vein M, a con- 

 siderable distance before its fork. The second 



fork of Rs skewed forward Trimicra 



nn The deflected base of Cui meets vein M after 

 or quite close to its fork ; the second fork of 

 Rs symmetrical Rhypholophus 



« Also Phyllolabis Doane, which appears to be indistinguishable by its venation from 

 Gonomyia; this is the only Phyllolabis known to me. i^^ .^ _ 



