CTENOPHORA. 335 



much longer than the head. Abdomen compressed and slightly 

 attenuated towards the tip. Dictenidia, Brulle. Species 1. 



a a. Male. Antennae with alternate long and short branches ; the short 

 branches hardly more than half the length of the long ones. Fern. 

 Antennae much longer than the head ; joints, except the first, nearly 

 globose. Abdomen nearly linear, compressed at the tip, hardly 

 attenuated. Species 2. 



a a a. Male. Antennae with alternate long and short branches ; the 

 former much longer than the latter. Fern. Antennae little longer 

 than the head; joints transverse; third joint much dilated. Abdo- 

 men fusiform, acuminated at the tip, but not compressed or attenu- 

 ated. Species 3, 4. 



a a a a. Fern. Antennae as long as the thorax ; joints most cylindrical, 

 successively decreasing in length from the third to the twelfth ; third 

 very long. Abdomen fusiform for half the length from the base, 

 from thence to the tip falciform, and much compressed and attenu- 

 ated. Species 5, 6. 



1. bimaculata, L. F. S. 1750 (1761) ; D. G. ; F. ; Gmel. ; Meig. ; 

 Mcq. ; Brulle; Zett. ; Gimm. ; Staeg. ; Boss. (V.). Nigra, thorace vittis 

 quatuor pedibusque fulvis, alis subcinereis fusco-bimaculatis, femoribus 

 tibiisque apice tarsisque fulvis. Long. 5-6 ; alar. 9-10 lin. 



Black, shining. Proboscis ferruginous. Palpi testaceous, black to- 

 wards the tips. Thorax tawny along each side, and with two tawny 

 dorsal stripes. Wings nearly limpid, with a brown spot at the tip of 

 the subcostal areolet, and with another at the tip of the wing ; trans- 

 verse veinlets clouded with brown. Halteres tawny, with piceous knobs. 

 Hind borders of the abdominal segments ferruginous. Legs luteous ; 

 tarsi and tips of the femora and of the tibiae piceous. 



Not rare. (E.) 



2. pectinicornis, L. F. S. 1735 (1761) ; F. ; Schr. ; Gmel. ; 

 Latr. ; Meig. ; Curt. ; Mcq. ; Zett. ; Staeg. ; Ross. (V.). nigro-crocea , 

 D. G. variegata, F. ; Meig. Kl. Nigra, thorace vittis duabus flavis, 

 alis subcinereis macula costali fusca, abdomine fulvo, vitta dorsali 

 apiceque nigris, pedibus fulvis, femoribus tibiisque apice tarsisque ni- 

 gris ; Fcem. abdomine maculis lateralibus flavis. Long. 7-11 ; alar. 

 11-15 lin. 



Black, shining. Proboscis tawny on each side. Palpi tawny, black 

 towards the tips. Antennae tawny at the base. Thorax yellow in front, 

 and with a yellow stripe on each side. Wings slightly greyish, with a 

 brown spot at the tip of the subcostal vein. Halteres testaceous. Ab- 

 domen tawny ; dorsal stripe and tip black. Legs tawny ; femora and 

 tibiae with blackish tips ; tarsi black. Fern. Abdomen with a row of 

 yellow spots along each side ; the black dorsal stripe sometimes ex- 

 tending over the whole surface except at the base. 



Not rare. Occurs near London, and as far west as the banks 

 of the Wye, near Chepstow. In a pupa supposed to belong to 



