NO. 1710. NORTH AMERICAN DRAGONFLIE^— WILLIAMSON. 389 



MACROMIA MAGNIFICA McLachlan. 



Length of abdomen: Male, 46.5-49 mm.; female, 50-51.5 mm. 

 Length of front wing: Male, 45-46 mm.; female, 48 mm. Length of 

 hind wing: Male, 44 mm.; female, 46 mm. Length of first tibia, 

 male, 7.5; hind femur, male, 12-12.5. Length of tibial keel in 

 length of tibia, male: First tibia, |; middle tibia, keel wanting. 



Antehumeral thoracic stripe long and wide, shorter than in annu- 

 lata and imcijica, and separated above by about 2 mm. from the an- 

 tealar sinus. Latero-ventral metathoracic carina broadly yellow. 

 Yellow ring on abdominal segment 2 w4de, interrupted in the mid- 

 dorsal line (in one specimen narrowly continuous over middorsal line 

 at the extreme apex of the ring), interrupted laterally at level of 

 auricles and with little or no pale color ventral to the level of the 

 auricles. Costa distinctly yellow to stigma or wing tip. 



Male. — Frons in front, sulcus above, anteclypeus, and base of 

 labrum reddish brown; rear of eyes shining black, as usual in the 

 genus; remainder of head pale, nearly white, including the vesicle; 

 lateral spots on frons about the same size as dorsal spots with which 

 they are continuous. 



Thorax rich reddish brown, apparently pruinose; dark area of 

 abdomen darker colored. Dorsal abdominal spots large, excepting 

 basal spots on 9-10, which are small and indistinct; on 3-8 separated 

 from base of segment by little more than a line of black; on 7 and 8 

 extended posteriorly beyond the transverse carina; not interrupted 

 dorsally on 3-8; dorsal spot connected with inferior lateral stripe 

 only on segment 8 and very narrowly there (segment 3 in magnijica 

 is thus very differently patterned from the same segment in annulata) ; 

 distinct ventral basal spots on 8 and 9. 



Wings hyaline; stigma very dark brown or black. 



Abdominal appendages distinctly different from those of all other 

 American species; the superior appendages seen from above straighter, 

 without trace of median external tooth, the apices less divergent; seen 

 in profile they are heavier just beyond the base than in iUinoiensis and 

 the upper and lower edges converge continuously to the apex; there 

 is a distinct, pale, basal external area on each superior; the inferior is 

 broad, triangular, and slightly shorter than the superiors. 



Female. — Similar to the male; dorsal pale spot on 3 produced pos- 

 teriorly more or less beyond the transverse carina (the merest hint 

 of this shows in the male; moreover, there is on 4-6 in both sexes a 

 very slight, scarcely distinct, posterior projection of the dorsal spots 

 beyond the transverse carina) ; dorsal spot on segment 3 narrowly in- 

 terrupted in the middorsal line; all dorsal spots isolated from inferior 

 lateral pale areas. 



Wings hyaline or slightly tinged with faint yellowish at base and 

 anteriorly beyond the nodus; stigma colorless, yellowish brown or 



