21 6 ENTOMOLOGICAL NEWS. [Sept., '03 



Note on a Small Collection of Dragonflies (Odonata) 

 from Baltimore, Maryland. 



By Dr. F. Ris, Rheinau, Switzerland. 



In the summer of 1891 I had occasion to collect a few 

 dragonflies at Locust Point, Baltimore. The visit was a very 

 short one, or rather there were two visits of five or six days 

 each in the latter half of summer, at the end of July and at the 

 end of August. I was then a ship's physician on a North 

 German Lloyd steamer ; many things had to be seen in these 

 short visits to the United States, and dragonfly-hunting was 

 but occasionally done in the immediate neighborhood of the 

 Lloyd pier at Locust Point, where some swampy ground attrac- 

 ted the Neuropterist's attention. Of course the results of this 

 hunting are quite modest, but nevertheless they seem to illust- 

 rate rather characteristically a certain type of coast fauna, so 

 that I thought the enumeration of my captures might not be 

 devoid of interest to the reader of Ent. News. Two species 

 only were captured in Druidhill Park and near Towson town 

 respectively; where not mentioned, the locality is Locust Point. 



1. Calopteryx maculata. Not rare in Druidhill Park. 



2. Lestes rectangularis . Very numerous ; a conspicuous 

 species with its elongate abdomen and bright blue eyes. 



3. L. disjundus. A few teneral specimens. 



4. Anoinalagrio7i hastahim. Common, females scarce. 



5. Ischmira verticalis. Very abundant. The numerous 

 females show a curious polymorphism. In some teneral 

 females of the green form the upper side of segments 8 and 9 

 is largely blue. I cannot see a trace of this blue in adult 

 green females and think I am sure that this condition is not 

 due to fading of colors. All green females have the pale ante- 

 humeral bands narrow in the manner of males. In several 

 orange females the antehumeral band is decidedly broader 

 than in the male and green female, but there is left a black 

 band on the humeral suture, so that the color-pattern remains 

 the same. These females have the base of abdomen orange to 

 the last fourth of segment 3 ; they are somewhat teneral and 

 their orange is very bright. The majority of orange females 



