DIPTERA. 283 



stripe, fenuginous towards the tip : legs black ; trochanters ferruginous ; 

 thighs tiuged with gray ; middle legs rather long : tvings very slighihj 

 gray ; veins black, pitchy at the base ; prffibrachial vein forming an almost 

 right angle at its flexure, near which it is curved inward, straight from 

 thence to the tip which is very near the tip of the fourth vein ; lower cross- 

 vein with the two usual curves which are slight : alulte luteous with 

 whitish disks : halteres yellow. Length of the body 4| lines ; of the wings 

 8 lines. 



Cape. 



ACHINA ALBIFRONS. r ' /f • ^ . - 



Nigra, cane scens; caput argeiiteum ; thorax nigro quadriviilatus ; scuteUum 

 testaceum ; abdomen cano-micans, lateribus basi ferrugineum ; tibia: 

 picece ; ahe srtblimpidce. 



Fam. Agridce ; Gen. Pales I' Fem. Black, with a hoary covering: 

 head with a silvery tvhite covering ; frontalia pitchy, striated, linear; a row 

 of bristles along each side ; epistoma -yellow, slightly prominent; facialia 

 without bristles along the face, with bristles on each side of the epistoma 

 and of the peristoma ; lateralia ferruginous : eyes bare : mouth pitchy ; 

 palpi tawny; feelers black; second joint reddish at the tip; third linear, 

 reaching the epistoma, nearly thrice the length of the second, reddish at 

 the base: chest withfonr black stripes ; middle pair slender ; scutcheon tes- 

 taceous : abdomen obconical, not longer than the chest, 2vith hoary reflec- 

 tions, ferruginous on each side towards the base : legs black ; thighs with a 

 hoary tinge ; hiees ferruginous ,• shanks pitchy : wings almost colourless ; 

 veins black, lawny at the base ; praebrachial vein forming an almost 

 right angle at its flexure, slightly inclined inward from thence to its tip, 

 which approaches near the tip of the cubital vein ; lower cross-vein almost 

 straight, the two usual curves being veiy indistinct : alulae white : hal- 

 teres tawny. Length of the body 4^ lines ; of the wings 9 lines. 



United States. 



