ULIDIA. 193 



a a. Palpi slender. 



b. Oviduct not flat nor cylindrical. 3. ORTALIS. 



b b. Oviduct flat or cylindrical. 4. TRYPETA. 



Some of the species in Ortalis and in Trypeta are mutually 

 nearer allied than they are to others in their respective genera. 



Genus I. PLATYSTOMA. 



PLATYSTOMA, Latr. G. C. iv. 354 (1809); Meig. ; Mcq.; Desv. 

 Musca p., F. ; Schr. ; Gmel. Dictya p., F. Trupanea p., Schr. 



Corpus latum, obscurum. Epistoma et peristoma turgida. Oculi magni. 



Proboscis crassa. Palpi lati. Antennae breves ; articulus tertius 



conicus, secundo paullo longior ; sextus nudus. Abdomen brevi-ob- 



conicum. Pedes sat validi. 



Body broad. Front a little longer than broad. Face nearly vertical. 

 Epistoma and sides of peristoma prominent. Eyes large, elliptical. 

 Proboscis and palpi thick. Antenna3 short, not reaching the epistoma ; 

 third joint conical, a little longer than the second ; sixth slender, bare. 

 Thorax with an indistinct transverse furrow. Wings moderate ; costal 

 vein ending at the tip of the wing ; subcostal vein ending beyond one- 

 third of the length; mediastinal vein ending much beyond half the 

 length ; radial ending a little before five-sixths of the length ; cubital 

 and prsebrachial very slightly diverging between the transverse veins, 

 almost parallel from the discal transverse to the border ; discal trans- 

 verse upright, hardly curved outward, parted by much more than its 

 length from the praBbrachial transverse, and by much less than half its 

 length from the border. Abdomen short-obconical. Legs rather stout. 



1. seminationis, L. Fn. 1874 (1761) ; F. ; Schr. ; Gmel. ; Latr. ; 

 Meig. ; Mcq. ; Desv. Nigra, flavo-punctata, antennis piceis, alis nigris 

 albo-guttatis, abdomine subtus flavo. Long. 2-3 ; alar. 4-6 lin. 



Black, dull, with numerous minute irregular yellow marks. Head 

 with white tomentum about the eyes. Antennae piceous. Proboscis, 

 palpi, and legs black. Wings black, with numerous white clots of va- 

 rious size. Halteres testaceous, with black knobs. Abdomen yellow 

 beneath. 



Common in Kent. (E.) 



Genus II. ULIDIA. 



ULIDIA, Meig. Zw. v. 385 (1826); Mcq.; Zett. Musca p., F. Te- 

 pJiritis p., F. Chrysomyza, Fal. 



Corpus breve, latum, metallicum. Caput transversum ; vertex latissi- 

 mus. Facies obliqua. Epistoma et peristoma turgida. Palpi crassi. 

 VOL. ii. 2 c 



