34 Aymals Entomological Society of America [Vol. VI, 



tellum black, the central line is narrowed to a point anteriorly, hardly- 

 reaching the front of the inesonotum, the flattened space is thickly 

 covered with white pollen; the front coxfe have pale hairs and black 

 bristles; the front tarsi a little infuscated on the last four joints, middle 

 ones fuscous from the tip of the first joint; abdomen with even black 

 bands on the tergum of seginents two to five. 



Described from two males and one female in the collection 

 of Prof. J. M., Aldrich taken in Polk Co., Wis., in July, by 

 Mr. Baker; and one female in the National Museum collection 

 taken at Franconia, N. H., by Mrs. Slosson. 



6 Neurigona tridens n. sp. 



Figure 6. 



Thorax dark reddish yellow, with a large three pronged black mark 

 on the dorsum; abdomen yellow with black bands. Length 3 1-3 mm. 



Female: Face silvery white; antennge yellow; arista yellowish 

 brown; front and occiput black with white pollen; orbital cilia white. 

 Dorsum of the thorax dark reddish yellow on the lateral and posterior 

 edges, and the humeri; central portion largely black, the black extending 

 to the front of the mesonotum, and on the posterior part fonning three 

 vittas, the central one ending in the fiattened space before the scutellum, 

 this space being also black, and the lateral vitt« not quite reaching the 

 scutellum; pleurse partly black, dorsum somewhat shining, thinly 

 pollenose, the pollen thicker on the flattened space; scutellum yellow; 

 metanotum black, abdomen yellow with broad black bands at the base 

 of the second to fifth segments, these bands occupy more than half of 

 the segments on the center of the tergum, but narrow laterally; venter 

 yellow; hairs and bristles of the abdomen black. Legs pale yellow; hairs 

 and bristles of the front coxae black; front metatarsi four-fifths as long 

 as their tibiae, the remaining four joints taken together but little longer 

 than the first ; front tarsi blackened from the tip of the first joint ; hind 

 tarsi shorter than their tibi^, the second joint longer than the first, last 

 four joints black, contrasting sharply with the pale yellow of the first 

 joint, but the extreme tip of the first joint brown. Wings brownish 

 hyaline; veins dark brown; fourth vein ends in the apex of the wing 

 rather close to the tip of the third vein. 



Described from one female in the collection of Prof. J. M. 



Aldrich, and taken on Mt. Constitution, Orcas, Idaho, July 



7, 1905. 



7 Neurigona signifer Aldrich. 



Neurigona signifer Aid. Transactions of the Entomological Society of London, 

 1896, pt. 3, p. 337. 



The following is a copy of the original description, as I have not 

 seen this species. 



"Male: Face very narrow, inimediatel}' under the antenna is a 

 triangular portion of yellow, below this there is only a narrow groove 

 between the eyes to below the middle, from this point the face pro- 



