May, "09] ENTOMOLOGICAL \K\YS. 203 



tegulae, legs below the extreme apex of the femora ferruginous. Wings 

 yellowish hyaline, venation ferruginous. Front, clypeus, thorax more 

 sparsely, femora and pygidium with golden pubescence ; apical dorsal 

 margins of segments 1-4 and ventral 2-4 with silvery pubescence. 



<3\ Length 12 mm. Anterior margin of clypeus in the middle pro- 

 duced into a low, slightly emarginate lobe ; three fairly distinct lateral 

 teeth. Furrow from lower ocellus not as strong as in the $. Vertex 

 like?, except there is a faint median furrow. Four basal joints of flagel- 

 lum rounded out beneath, the fifth slightly so ; first joint a little longer 

 than the preceding one, straight on the inside margin, oblique on the 

 outer margin. Thorax like 9 , except that perhaps the scutellum is a 

 little more strongly impressed. Legs not strongly spinose. Longest 

 spur of hind tibiae shorter than the basal joint of hind tarsi. Second and 

 third cubitals about the same width on the radius. Eighth ventral seg- 

 ment narrowly angularly notched ; lobes broad, obtusely rounded. Black; 

 apical half of mandibles piceous ; palpi, tegulae, knees and legs below, 

 ferruginous. Wings yellowish ; venation ferruginous. Front and clypeus 

 with golden pubescence ; thorax, femora and basal segment of abdomen 

 with long fulvous ; apical dorsal margin of abdominal segments 1-5 and 

 ventral 2-4, also the pygidial area with silvery pubescence. In one ^ the 

 silvery pubescence of the fifth dorsal segment is wanting. 



Hab. A and 9, Milwaukee Co., Wis., number 22372, 

 and aS , Racine Co., Wis., number 24483. Types in the Pub- 

 lic Museum of Milwaukee. 



In Fox's Monograph of the North American Species of 

 Tachytes [Trans. Am. Ent. Soc., xix, 1892], the female runs 

 between praedator Fox and calcaratus Fox. From pracdator it 

 may be known by the smaller teeth of the clypeus ; the pres- 

 ence of the large punctures on the superior orbits; the broader 

 second cubital cell; the lack of such abundance of golden pubes- 

 cence. From calcaratus it differs in having the middle furrow 

 of metauotum not fainter than in pracdator, but stronger ; the 

 golden pubescence of the front ; and it is 3 mm. smaller. It 

 is much like propinquus Rob.., but the metanotum is not so 

 strongly furrowed, the pygidium is golden, not bronzy, etc. 



The above male differs in a number of points from the female 

 but is probably the male of the described female. It was 

 taken in the same locality. In Fox's Monograph the $ runs 

 to validus Cress., but is smaller, the lobes of the eight ventral 

 segments are broader ; the furrow of the vertex is weaker, 

 etc. If it should run to calcaratus it would be known from it 



