232 



brown on coxae, apices of femora, bases of hind tibiae, apices of all 

 tibiae, apices of first three tarsal joints, and the whole of last two 

 tarsal joints. Wings clear, veins brownish. Halteres yellow, or 

 slightly browned, or apically blackened. 



Frons broad at vertex, equal to about one fifth of the width of 

 head, becoming almost linear at the anterior margin; second joint 

 of antenna globose, third joint slightly longer than second and as 

 long as the next two together, hairs very short, length of antenna not 

 equal to that of head and thorax together. Mesonotum with very 

 short, soft discal hairs; scutellar hairs more distinct on margin. 

 Abdomen narrowed at base and apex, club-shaped. Legs slender; 

 basal tarsal joint as long as the next three ; joints 3 and 4 short, 5 

 longer than 2, spinose ventrally; tarsal claws large, subequal, each 

 with a sub-basal tooth. Wings with third vein extending more than 

 three fourths of the distance to apex ; fourth vein forks before the 

 cross vein; costa with very weak short hairs. 



Length, 2.75-3.5 mm. 



Originally described from British Columbia. 



Represented in the collection here by examples from Algonquin — 

 eight specimens, all taken in May of various years (Nason) — and 

 Havana, on the Illinois River — one specimen, also taken in May (C. 

 A. Hart). 



The male is undescribed. 



I have not seen Coquillett's type specimen, but the examples 

 before me agree in all essential particulars with the description of 

 caudelli given by him. 



To make the foregoing revision of the genus J oliannseniella as 

 complete as possible it may be added that magnipennis Johannsen 

 agrees with the description of alharia Coquillett, the latter of which 

 Johannsen did not include in his list of species belonging to this genus 

 when he described niagnipennis. Johannsen's species flaviceps I am 

 unable to include in my table as I do not wish to assume the presence 

 of characters not mentioned in the description. Provided, however, 

 that it really belongs to this genus it should fall, in my key, in the 

 same section as arctico and magna, from both of which it differs in 

 size, being 2 mm. in length, and in the color of legs and halteres, the 

 latter being black. I may indicate that the color description, and in 

 fact all the essential characters given by Johannsen except the absence 

 of femoral thorns, agree with those of Palpomyia trivialis Loew. 



The European species lactcipcnnis Zetterstedt has been recorded 

 from Greenland by Lundbeck. I have not seen the species, but it 

 may be known from arctica by the different color and venation of the 



