Vol. xxii] ENTOMOLOGICAL XEWS 221 



A new Gomphus (Odonata). 



By Richard A. Muttkowski, Public Museum, IMilwaukee, 



Wisconsin. 



Gomphus brimleyi sp. nov. 



Colors olivaceous green and brown on head and thorax, yellow and 

 black on abdomen. 



$. — Face olivaceous green, a line of pale brown at the upper end of 

 the labrum and on the suture of nasus and frons; otherwise immacu- 

 late. Frontal ridge narrowly edged with yellow. Vertex black, the 

 postocellar ridge each side with a rounded spot above the lateral ocel- 

 lus, the two spots connected by a fine line of green. A ring of white 

 around the base of each antenna. Occiput olive, flatly curved. Head 

 yellow behind, a vague black stripe from the occipital edge of the eyes 

 to the foramen, which is narrowly margined with black. 



Prothorax brown above, the anterior edge lined with olivaceous 

 green; a median geminate dorsal spot, a latero-dorsal and latero-infer- 

 ior spots of olive. Posterior lobe short, straight, olive, the extreme 

 edge lined with brown. 



Thorax olivaceous green, marked with brown. Dorsal carina pale, 

 a stripe of brown on each side, both coming together to a point at the 

 antealar sinus, each stripe widening in front to twice the width at the 

 carinal spine, but not reaching the olive collar. Antehumeral brown, 

 narrowed above to a point, separated from the humeral by a pale stripe 

 one half its width. Humeral as wide as the antehumeral, but widening 

 above to twice the medial width. Sides with a stripe of brown on the 

 first and second lateral sutures, the first as wide as the antehumeral, 

 the second half as wide ; each extending in a fine sutural line to the 

 coxae. Interalar spaces olive, the wing bases tipped with yellow. Legs 

 brown, the femora beneath and the tibiae externally, olivaceous. Tarsi 

 uniformly brown, except the first and second joints of the hind tarsi, 

 which have a superior yellow line. 



Abdomen black and yellow, olive at the sides on the basal segments. 

 Dorsum with a well-defined line of yellow on i to 8, J^ mm. wide, 

 growing brighter yellow toward the apical segments, interrupted nar- 

 rowly at the joints. The line ends on 8 at two-thirds in an elongated 

 triangle, which is continued to the apex of the segment in a very nar- 

 row line. Segments 7-9 with the extreme apex edged with yellow. 

 Sides of 1-2, and 3 basally, with lower half olivaceous yellow, 4-6 with 

 indeterminate yellow laterally, 7-10 with inferior half bright yellow. 

 Segment 9 black above, 10 brown. Appendages brown, black at tips. 



Appendages as long as 10. Superiors divaricate, externally truncate, 

 an inner triangular prolongation one half the length of the appendage. 



