NORTH AMERICAN NEUROPTERA. 229 



A Synopsis of the Odoiiat Genus L.EITCORHIIVIA Biitt 



BY DR. H. A. HAGEN.* 



[The genus Leucorhinia was first cliaracterized by C. C. Brittinger 

 in 1850, as follows : 



The followiug species, which, by the metallic lustre of the upper surface of 

 their body, by the form, dorsal flanks and appendages of the abdomen, by a tri- 

 angular black spot on the base of the hind wings, and by their white frons and 

 uasus, form a very natural group, I have already separated in 1845, as a distinct 

 genus under this name. (Translated from Sitzungsber. Akad. Wissenschaft. 

 Wien, 1850, Bd. iv, p. 333.) 



The "following species" are: 1. rubicunda luinn. ; 2. pectoralis 

 Charp. ; 3. dubia Vander Lind. ; 4. albifrons Burm. ; 5. caudalis 

 (,'harp. ; 6. oruata Britt. (^ caudalis CharjD.) 



Dr. Brauer in his Verzeichniss der bis jetzt bekannten Neuropieren 

 im Siiine Liwie's, Zweiter Abschnitt (Verhdl. k. k. zool.-bot. Gesell. 

 Wien, xviii, pp. 711-742, 1868) places the genus Leucorhinia in the 

 "Fourth Group" of the " Tribus Libellulina.'' This fourth Group 

 is characterized by having 



The costal margin on the basal side of the nodus entire, suture between the 

 eyes short, triangles equally placed, i. e. those of the hind wings reaching as far 

 outwards as the middle cellt of the forewings. 



The genus Leucorhinia belongs to the second section of the fourth 

 group, which section includes those 



Species with heart-shaped, almost entirely four-sided hind margin of the pro- 

 thorax, notched or broadly bilobed on the free margin ; only one, or at the most 

 two (then mostly uusymmetrical) cross veins in the middle cell. The triangle 

 of the hindwings reaches as far outwards as the end of the middle cell in the 

 forewings. Both triangles normal (i. e. the anterior side not broken). Vulva 

 mostly covered, when open the last segments are very short; hamules always 

 bifid. Eyes always united for a short distance. Claws with a tooth. 



Lastly the genus Leucorhinia is itself characterized as follows : 



Sectors of the arculus arising separated from a point. Hindwings broader at 

 the base. Membranule distinct. Triangle moderately wide. Eeticulation other- 

 wise as in Diplax. Less than ten autecui)itals; 2-3 discoidal rows. Lobe of pro- 

 thorax large, broad, bilobed. Abdomen slender, somewhat shorter than the 

 wings, more or less widened in the male, somewhat thicker at the base. Geni- 

 talia little prominent, vulva covered, the valve often shrunken. Sides of the 

 eighth segment not widened. 



Dr. Brauer included in Jjeucorhinia the fjllowing s])ecies : pecto- 

 ralis, dubia, rubicunda, albifrons, caudalis, intacta, Jiudsonlca, elisa 

 Hag., amanda Hag., ornata Ramb. and 2 sp. Ind. Orient. 



* In February, 1890, Dr. Hagen sent me the MS. of this paper and the accom- 

 panying figures (see PI. x) with permission to publish the same. With his con- 

 sent, I have made some additions to his paper. These are enclosed in brackets 

 [], and for them I alone am responsible. — Philip P. Calvert. 



t Median space, espace median, lower basal cell, of other authors. 



