270 SYRPHIDJ!. 



broad, ovate, acute, shorter than the labrum. Maxillae subulate, a 

 little longer than the lingua, almost as long as the palpi. Palpi short, 

 thick, cylindrical, pubescent, obtuse, clothed with short hairs at the 

 tips. Labium short, thick, semicircular. Antennae 5 -jointed, projecting, 

 uutant, seated on a prominent part of the front, jointly shorter than the 

 breadth of the liead ; first and second joints short ; first clavate, bristly ; 

 second broader, subcyathiform, shorter and broader than the first ; third 

 large, pubescent, compressed, oval or oblong, concave at the base ; 

 fourth very minute, seated on the third near the base ; fifth pubes- 

 cent, rather short, setiform. Thorax subquadrate, convex, pubescent. 

 Wings lanceolate, finely pubescent, incumbent and parallel in repose ; 

 subapical areolet entire; axillary lobe distinct; subcostal and radial 

 veins ending separately in the margin ; transverse prcebrachial vein placed 

 before the middle of the discal areolet. Halteres uncovered. Abdo- 

 men subfusiform, pubescent, almost flat ; segments slightly impressed 

 on each side. Legs short, stout, pubescent ; metatarsi as long as the 

 other four joints ; hind legs longer and stouter than the anterior. 



This genus is allied to Xylota in the structure of the mouth. 

 The species may be thus grouped : 



a. Abdomen with yellow bands or spots. Species 1-8. 

 a a. Abdomen unspotted. Species 9. 



1. quadrimaculata, Pz ! fn. Ixxxvi. 19; Fin. (1816); Mg. ; 

 St. F. et Srv. ; Mq. ; Ztt. ; Lw. Nigro-asnea, capite chalybeo, anten- 

 nis nigris, alis subcinereis fusco-nebulosis, abdomine maculis duabus 

 magnis subquadratis flams duabusque parvis transfer sis angustis fulvis, 

 genubus tarsisque fulvis. Long. 5 ; alar. 10 lin. 



.ZEneous-black. Head bluish-black. Antennae black. Wings greyish, 

 clouded with brown beneath the stigma. Abdomen with two large sub- 

 quadrate yellow spots on the second segment, and with two transverse 

 slender slightly oblique tawny streaks on the third. Legs black ; knees 

 and tarsi tawny. 



Not common. In the collection of the Entomological Club. (E.) 



2. quadriguttata, Mq. d. n. 8 (1827). d. i. 570. 10. Nigro- 

 senea, antennis piceis, alis subcinereis, abdomine maculis fulvis duabus 

 magnis subquadratis duabusque parvis arcuatis obliquis, tibiis piceis, genu- 

 bus tarsisque fulvis. Long. 4|- ; alar. 9 lin. 



jEneous-black, clothed with tawny hairs. Antennas pieeous. Wings 

 slightly grey. Abdomen with two large subquadrate tawny spots on 

 the second segment, and with two small curved oblique tawny spots on 

 the third. Legs black ; tibias piceous ; knees and tarsi tawny. 



Not common. In the collection of the Entomological Club. (E.) 



3. noctiluca, L. fn. 181 (1761) ; Fb.; LI. ; Fin. ; Mg. ; St. F. 

 et Srv.; Mq. ; Lw. ; Ztt. rosarum, Pz. ! fn. Ixxii. 24. 'xcv. 21. 



