NO. 1571. DRAGONFLIES OF BURMA AND SIAM— WILLIAMSON. 



307 



at the base of the superior appendages. Abdomen black beneath. 

 (See fig. 33.) 



Described from four males fi'om Burma sent me by Mr. R. A. 

 Earnshaw. One of these was sent to M. Rene Martin and Professor 

 Foerster, who regard it as an undescribed species. 



Paratype. — Cat. No. 10451, U.S.N.M. One specimen. The type 

 is in the author's collection. 



The small series shows an extent of variation in color remarkable in 

 a species of Gomphus. This is most evident on tiie sides of the 



Fig. 3:i.— Gomphus xanthenatus from Burma. A, lateral, ani> B,- dorsal views of male 



ABDOMINAL APPENDAGES, IN THIS SPECIMEN UNNATURALLY COMPRESSED BY THE ENVELOPE IN 

 WHICH SPECIMEN WAS PRESERVED; IN C, VENTRAL VIEW OF INFERIOR APPENDAGE, ANOTHER 

 SPECIMEN IS FIGURED. AND THE INFERIOR APPENDAGE IS NOT DISTORTED! IN THIS SPECIMEN THE 

 APICES OF THE SUPERIOR APPENDAGES ARE SEPARATED BY l'^ THE DISTANCE REPRESENTED IN B, 

 AND THE INFERIOR APPENDAGE IS EQUALLY DIVARICATE; D, PROFILE OF ACCESSORY GENITALIA OF 

 ABDOMINAL SEGMENT 2. E, LATERAL VIEW OF SUPERIOR ABDOMINAL APPENDAGE OF A SPECIMEN 

 DIFFERING FROM A IN HAVING THE LOWER SUBAPICAL EDGE ROUNDED, NOT ANGULATE, AND MINUTELY 

 TOOTHED. 9 AND 10, ABDOMINAL SEGMENTS. 



thorax and on abdominal segments 8-10. Throughout the descrip- 

 tion the pale markings have l)een described as yellow. It is probable 

 that in life these are not of the same color throughout, tending to 

 greenish on the thorax and to orange on the abdomen, excepting that 

 the pale area of 9 is probably clear yellow, paler than the markings of 

 the segments anterior to it. Venationally, if the frequent presence 

 of the basal antenodal of the second series is disregarded, this species 

 and the Japanese melsenops De Selys are similar to North American 



