NOKTII AMERICAN DIPTKRA. 273 



Till: \ORTII A.nFKK'A^i CiKlVERA OF CAL,1I*TRATE 

 l»ilIS<'ID/E. Paper 1II.» 



BY C. H. TYLER TOWNSEND. 



The following synopsis contains all the genera of the Dexiithio thus 

 far recognized and described from America north of Panama, except 

 some genera to which species have been wrongly referred, and which 

 are, so far as possible, omitted. Notes on the latter will be found 

 at the end of this paper. 



A word may be offered upon the relations existing between the 

 higher groups of Tachinidiiei and Dexiidse. The group Prosenina? 

 occupies, in the Dexiidse, the .same position which the group Hystri- 

 ciinae does in the Tachinida;. It includes robust forms, with the 

 apical cell open and ending a little before the apex of the wing, 

 agreeing in this respect with the above group of Tachinidse. These 

 forms further agree with each other, and differ froni all the other 

 genera in the Dexiidre, in the character of the proboscis. The gen- 

 era Hysfrisiphona, Hystriehodexia and Bathydexia, approach Dejeania 

 and its allies in the character of the spiny macrochietie. 



The present .syno|)tic table is based uj)on the one given by Mr. 

 van der Wulp for the Central American genera, in the " Biologia 

 Central!- Americana." 



Synoptic table of the North American genera of 

 DKXUDJE. 



1. Proboscis elongate, slim, not retractile, usually as long or longer than the 



dorso-ventral diameter of the head (subfamily Proseuina>) •>. 



Proboscis shorter than head, thick and fleshy, retractile 13. 



2. Proboscis slender and rigid, nearly or quite as long as head and thorax to- 



gether, label la small 3. 



Proboscis but little longer than the head, labella distinct 7. 



3. Scntellnm and abdomen armed with spines HyfJitriMiplioiia Big. 



Scutellum and abdomen with the usual macrochaitse 4. 



* Paper I was published in Proc. Ent. See. Washington, ii, pp. 89-100. Paper 

 II. in Trans. Am. Ent. Soc. xix, pp. 133-144. 



TRANS. AM. ENT. SOC. XIX. (35) DECEMBER, 1892. 



