330 *  ENTOMOLOGICAL NEWS. [July, 16 
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 temporale, Chapada, Matto Grosso, Brazil, 
det P.aP. Calvert: 
Figs. 3-4, Acanthagrion apicale, Tumatumari, British Guiana, Feb. 
10, 1912, det. E. B. Williamson. 
Figs. 5-7, Acanthagrion interruptum, 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 cuyabae, Cuyaba, Brazil, det. P. P. Calvert. 
Figs. 18-19, Acanthagrion laterale, 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 indefensum, Wismar, British Guiana, Feb. 
16, 1912, collected by E. B. Williamson. 
Figs. 24-25, Acanthagrion truncatum, 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 Cuartes T. Brues, Bussey Institution, Harvard 
University. 
In 1890 Ashmead! erected the genus Dolichopszlephus for a 
species of Porizontine Ophioninae with greatly elongated maxil- 
lary palpi. Dolichopselephus has recently been regarded by 
Szépligeti? 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 Szépligeti 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 
closestouthe =pleural caninas.2- 4 see eee eee Heterocola. 
Antennae consisting of 30 joints; metathoracic spiracle not lying next 
tonuthe spleiralscaritia: .05.25 cco ee oe ee Dolichopselephus. 
1 Bull. Colorado Biol. Assoc., No. 1. p. 23. 
2Gen. Insec., Fasc. 34. p. 56 (1005). 
