324 



in catsup and decaying vegetables and reared from potatoes. The 

 larvae are numerous in privies in the Southern States and in Central 

 America. 



Nemotelus Geoffroy 



I have not seen the larva of any species of this genus. Lundbeck* 

 has described and figured the larva of the European pmithcrina, which 

 agrees in general characters with idiginosus, also of Europe, previous- 

 ly described by Halidayf. 



The characters that serve to separate the larvae of Nemotelus from 

 those of Oxycera are given in the key to the larvae of this subfamily 

 (Clitellarinae). 



The larvae are aquatic, and although unknown to me must be 

 common in suitable situations throughout the state, since in the 

 imaginal stage at least one species commonly occurs from June to 

 August on various flowers. 



Oxycera Meigcn 



GENERIC CHARACTERS 



Larva and Puparimn. — I have found only one larva that I con- 

 sidered as belonging to this genus, and unfortunately it was not pre- 

 served when it died. Lundbeck's description of the larva of trilineata 

 is the best available, and the following data are drawn from his 

 paper. $ 



Head conical, with small eye-spots on the anterior part and small 

 antennae anterior to them. Segments broader than long, only the 

 apical one a little longer than broad, rounded behind. Dorsum with 

 stout bristles which are thickened apically, arranged in pairs, 2 pairs 

 on each side of median line, the median pairs close together, and 

 in addition to these bristles, which are near the posterior margin, sev- 

 eral appear laterad of them and also a transverse series of much 

 shorter bristles near anterior margin; lateral margins with a pair of 

 strong bristles on each segment, including the apical one. Posterior 

 spiracular chamber at apex, fringed with long hairs ; abdominal seg- 

 ments I to 6 with rudimentary lateral spiracles. 



*Diptera Danica, Part I, p. 23. (1907) 

 tNat. Hist. Rev., No. Ill, 1857, p. 194. 

 tDiptera Danica, Part I, p. 31. (1907) 



