LYRONEURUS. 109 



and ends long before the tip of the wing, although its end is very 

 much curved backwards ; the posterior transverse vein is very 

 short and lies much before the middle of the wing, so that the hist, 

 segment of the fourth longitudinal vein becomes uncommonly long ; 

 the latter diverges very much from the third longitudinal vein, is 

 entirely interrupted upon its second third and the last third, which 

 is remarkable by its slenderness, is pushed forward towards the 

 third longitudinal vein. 



Iiab. Cuba. (Poey.) 



Observation. — The interruption of the last segment of the fourth 

 longitudinal vein is particularly striking in this species; a trace 

 of it is also found in some of the European species. The position 

 and the course of the third longitudinal vein recall the neuration 

 of Lijroneurus. 



Gen. XXIX. I/irROXElRUS. 



The following are the characters of the genus Lyroneurus : 

 The body is elongated. Eyes upon front and face widely sepa- 

 rated in both sexes. Antennae short ; the first joint not hairy, the 

 second transverse, the third short, rounded, distinctly pubescent ; 

 arista apical. Wings very large, at the tip broad and very ob- 

 tuse ; the posterior transverse vein does not approach the margin 

 of the wing ; the third longitudinal veiu very close to the second 

 and very much turned backward at the end ; the space between 

 the third and fourth longitudinal veins remarkably broad; last 

 segment of the fourth longitudinal vein distinctly inflected. Feet 

 rather long, but not very slender; first joint of t lie hind tarsi 

 without bristles. Pulvilli of the fore tarsi in the male not elon- 

 gated. Hypopygium small, imbedded, at the posterior end with 

 tour strong bristles ; its appendages are very small and hidden. 



The genus Lyroneurus is by far the next related to the genus 

 Diaphorus. A more minute examination of the American spe- 

 cies of Diaphorus has satisfied me that this relationship is 

 greater than I supposed, when establishing the genus Lyro- 

 neurus (Wien. Ent. Monatsch. I, 37). The larger size of the 

 wings, which are very broad at the tip, the greater breadth of the 

 space between the third and fourth longitudinal veins, the distinct 

 flexure of the last segment of the fourth longitudinal rein and the 

 not elongated pulvilli of the fore tarsi in the male, these are the 



