CHRYSOTOXUM. — PARAGUS. 



5 



Chrysotoxum, Meigen, in Illiger's Magazin, ii. p. 275 (1803). 



1. Chrysotoxum integre. 



Chrysotoooum integre, Willist. Synopsis N.-Am. Syrphidfe, p. 16 \ 

 Hab. Umted States, Arizona K — Mexico, Northern Sonora 



Two specimens from Sonora, male and female, agree with the description ; the black 

 of the fifth abdominal segment is perhaps better described as forming an elongate 

 V-shaped mark. 



2. Chrysotoxum 



Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 



A single female specimen differs from C. integre in having the first two joints of the 

 antennse somewhat more elongate, the pile of the abdomen posteriorly longer and 

 denser, the abdomen itself narrower, and with slender and more V-shaped bands ; the 

 coalescence of the hind band of the fourth segment with the yellow in front at the 

 middle ; ancl the black of the fifth segment forming two slender, straight, convergent 

 vittulae. 



3. Chrysotoxum 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



Two specimens, male and female, possibly referable to C. laterale, Loew, described 

 from Nebraska. I have never been sure of the identification of Loew's species, and am 

 less so here. The first joint of the antennse is longer than the second, the white 

 vittulse of the thorax are not conspicuous, and only the first abdominal fascia is 

 interrupted ; the black of the fifth abdominal segment forms an inverted V, not a Y. 

 From a ypsilon, Willist, it may be distinguished by the less divergent rami of the 

 black of the fifth abdominal segment. 



PABAGUS. 



Paragus, Latreille, Hist. Nat. Crust. et Ins. xiv. p. 359 (1805). 



1. Paragus dimidiatus. 



Paragus dimidiatus, Loew, Centur. iv. no. 63, in Berl. ent. Zeitschr. 1863, p. 308 1 ; Willist. 

 Synopsis N.-Am. Syrphidse, p. 20 (translation) . 



Hab. United States, District of Columbia Mexico, Northern Sonora 

 Ciudad in Durango 8100 feet (Forrer), Amula in Guerrero 6000 feet (H H. /5 



Three specimens, agreeing well with Loew's description of P. dimidiatus ; it is perhaps 

 not really distinct from P. tibialis. 



