330 ENTOMOLOGICAL NEWS. [J u ty ' J 6 



EXPLANATION OF PLATE XVIII. 



Drawings of the penes of the species of Acanthagrion, being lateral 

 and ventral views of the last two segments. 



Figs. 1-2, Acanthagrion tcmporale, Chapada, 'Matto Grosso, Brazil, 

 det. P. P. Calvert. 



Figs. 3-4, Acanthagrion apicalc, Tumatumari, British Guiana, Feb. 

 10, 1912, det. E. B. Williamson. 



Figs. 5-7, Acanthagrion interrupt it in, Concepcion, Chili, Jan., 1905, 

 det. P. P. Calvert. Fig. 7 shows the median internal hook. 



Figs. 8-9, Acanthagrion "gracile," Gualan, Guatemala, June 14, 1905, 

 det. E. B. Williamson. 



Figs. 10-11, Acanthagrion ablutum, Coroico, Yungas, Bolivia, May 

 10, 1899, det. P. P. Calvert. 



Figs. 12-13, Acanthagrion ascendens, Cunapo River, Trinidad, Feb. 

 27, 1912, det. E. B. Williamson. 



Figs. 14-15, Acanthagrion kennedii, Cunapo River, Trinidad, Feb. 27, 

 1912, det. E. B. Williamson. 



Figs. 16-17, Acanthagrion cuyabac, Cuyaba, Brazil, det. P. P. Calvert. 



Figs. 18-19, Acanthagrion latcrale, Bogota, Columbia, Lindig, 1863, 

 det. P. P. Calvert. 



Figs. 20-21, Acanthagrion adustum, Wismar, Brit. Guiana, Feb. 15, 

 1912, collected by E. B. Williamson. 



Figs. 22-23, Acanthagrion indefcnsum, Wismar, British Guiana, Feb. 

 16, 1912, collected by E. B. Williamson. 



Figs. 24-25, Acanthagrion tnincatum, Chapada, Matto Grosso, 

 Brazil, det. P. P. Calvert. 



Figs. 26-27, Acanthagrion cheliferum, Rio Grande do Sul, Brazil, 

 H. von. Ihering, det. P. P. Calvert. 



An American Species of the Ichneumonid Genus 

 Heterocola Forster (Hym.). 



By CHARLES T. BRUES, Bussey Institution, Harvard 



University. 



In 1890 Ashmead 1 erected the genus Dolichopsdephns for a 

 species of Porizontine Ophioninae with greatly elongated maxil- 

 lary palpi. Dolichopsclephus has recently been regarded by 

 Szepligeti 2 as a synonym of Heterocola Forster, a genus rep- 

 resented by three European species. The characters given by 

 him for Heterocola however, do not agree with those given by 

 Ashmead for Dolichopselephus in several respects and it is 

 evident that Szepligeti has been led by the peculiarly modified 

 maxillary palpi to consider the two genera inseparable. They 

 may be easily distinguished as follows : 



Antennae with not over 20 joints: metathoracic spiracle lying very 

 close to the pleural carina Heterocola. 



Antennae consisting of 30 joints; metathoracic spiracle not lying next 

 to the pleural carina Dolichopsclephus. 



1 Bull. Colorado Biol. Assoc., No. i. p. 23. 



2 Gen. Insec., Fasc. 34. p. 56 (1905). 



