364 ACADEMY OP NATURAL SCIENCES 



yellowish : orbits yellow, somewhat golden : antennae black, third 

 joint hardly longer than the second, subovate : front with a much 

 dilated velvet-black vitta : thorax black, with a dilated golden 

 vitta each side before : wings black, opake, gradually paler on 

 the thinner margin ; apical cross nervure confluent with the ex- 

 terno-medial nervure before the tip ; poisers and scale yellow : 

 feet black ; thighs at base, coxae and abdomen ferruginous. 



Length three-tenths of an inch. 



The wing nervures are like those of P. semicinerea Meig. 



2. P. JUGATORIA. — Black, abdomen ferruginous ; thorax with 

 golden lines before. 



Inhabits Indiana. [173] 



Front golden, with a dilated fuscous vitta : hypostoma whitish, 

 with two black lines each side descending from the antennse : 

 antennae fuscous, first joint very short, third ovate, longer than 

 the second : proboscis blackish : palpi yellow : thorax black, a 

 transverse golden line before the middle, from which proceed 

 five golden lines to the anterior margin, the lateral ones more 

 dilated and anterior to the wings black, opake; posterior margin 

 abruptly hyaline ; apical cross nervure rectilinear, confluent 

 with the apex of the wing at the tip of the externo-medial ner- 

 vure : poisers and wing scale pale ferruginous : abdomen pale 

 ferruginous, black at tip : feet black ; thighs at base, and coxae 

 pale ferruginous ; posterior tibiae deeply ciliated with dilated 

 scale-like hairs. 



Length three-tenths of an inch. 



This cannot be the Thereva lanijjes of Fabr. of which the 

 thoracic lines are said to be white, and the abdomen black, im- 

 maculate ; neither can it be the Thereva pilipes Fabr., which is 

 said by Wiedemann to be a Phania, for the antennae of our species 

 have not the third joint " elongated and linear " as in that 

 genus. It seems also allied to Dictya pennipes Fabr., which, 

 however, has a large ferruginous spot on the wing. 



[This is a Trichopoda Latr., previously described as T. (Dicfi/a) 

 pennij)es Fabr. Say described the male ; the female has a ferru- 

 ginous spot at the base of the wing, and the abdomen is entirely 

 ferruginous. — Sacken.] 



[Vol. VI. 



