100 DRAGONFLIES OF OHIO. 



white. The thorax and abdomen of teneral specimens 

 are lighter colored and not pruinose. 



Female similar to the male. 



This is the smallest species of the genus, taken in 

 the state. 



Four males taken at Stewart's Lake in Portage 

 County, June 21, 1898. Not reported from any other 

 section. 



Lihellula quadrimaculata, Linn. 



Length : of abdomen o 71 30, 9 30 ; hind wing o 71 35, 

 9 36. 



Male, colors olive, fuscous and yellow. Frons 

 above black, in front yellowish, nasus and rhinarium 

 olive, labrum yellow in the middle, edges black, labium 

 yellow on the side, black between; rear of eyes black 

 with two yellow spots. Thorax with narrow humeral 

 and side stripes black, and two prominent spots 

 yellow, prothorax and legs black. Front wings 

 yellowish at base, nodal spot small, fuscous, hind 

 wings with a basal, fuscous patch below the sub- 

 median vein ; superior to this yellowish, nodal spot as 

 in the fore wings. Abdomen yellowish or olive with 

 black on venter and dorsum of 7—10. 



The female has a conspicuous row of yellow dashes 

 on each side of the abdomen from segment 3 to 9. 



This species has been taken in the central and 

 northern parts of the state but seems to be rare. It is 

 on the wing in June. 



Libellula semifasciata, Burmeister. 



Length : of abdomen o 71 26-28, 9 25-27; hind wings o 71 

 35-37, 9 36-3s. 



Male, colors yellowish and fuscous; front yellow- 

 ish, largely replaced by red. Rear of eyes brown with 

 yellowish outer margin. Thorax browish yellow with 

 two lighter colored lateral bands ; femora at base 



