72 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



CosT.^ Rica: Cartago, May 17, and October 7, (P. P. Calvert; along 

 ditch); Near San Isidro, August 21, (P. P. Calvert; near river), [all A. N. 

 S. P.].' 



V ari at i 071. —There is sonic variation in the size and in the 

 number of clear spots along the veins in the wings. The wings 

 having the spots small and more numerous seem to occur mainly 

 in the western specimens. The maculation pattern shows very 

 little variation. 



Tribe Euthycenni 



The genera of this tribe are characterized by the white, bare 

 or plumose arista, and the scutellum with four bristles. The 

 Sepedontini also has the arista white, but with only two scutellar 

 ))ristles. The antennae in the present tribe are generally stout, 

 with the second joint broad and rectangular. In Dictyomyia we 

 have an aberrant genus which probably represents another group. 

 It is placed in this tribe for convenience, as I do not think it 

 advisable to propose another tribe on the present knowledge of 

 its relationship. 



EUTHYCERA Latreille 



1829. Latreille, Cuvier, Reg. Auim., v, 529. 



1900. Liuiujcra Hendcl, Verb. K. K. Zool.-Bot. Gesell.; Wien, 1, 344. 



Latreille erected this genus for species allied to Scatophaga 

 chaerophylli Fabricius. The original citation refers to this species 

 by name, so that the genus is perfectly valid and has for its geno- 

 type Musca caerophylli Fa])ricius. It was originally considered, 

 and is, as now understood, very distinct from the Tetanocera of 

 authors. Lunigera Hendel was based on the same species, Euthy- 

 cera being apparently overlooked by that author. 



Similar in general aspects to Chaetomacera. Head longer in 

 proportion to its height; frons horizontal; lunule exerted, with 

 a prominent, sharp, carina between the antennae. In the known 

 species there is no lateral, polished, frontal stripes. Second 

 antennal joint rectangular, bare on lateral upper surface; arista 

 white pubescent or plumose. Mesonotum irrorated; sternopleura 

 setuloso. Squamae black ciliate. Wings fuscous, reticulated, 

 .sometimes densely so with quadrate white spots; small cross-vein 

 before middle of discal cell. Fifth abdominal segment of male 

 much shorter than fourth. 



