1908.] NATURAL SCIENCES OF PHILADELPHIA. 481 



two localities. Of the remaining endemic species taken at Gualan, 

 two (Argia frequentula, Telebasis digiticoUis) were taken also at both 

 the other places, one {Telebasis salva) also at Los Amates, one {Argia 

 indicatrix) also at Puerto Barrios. 



Some other data are presented in Table 10 (see pp. 482, 483). 



To illustrate the seasonal distribution more fully, the following 

 lists of the species taken at three different localities are appended; 

 the number before each specific name is the same as that employed 

 in the list of species. Table B, of the Introduction, Biol. Cent.-Amer. 

 Neurop.; names printed - in heavy face type in this and other lists are 

 those of species endemic in Mexico and Central America. 



DisTRiTo Federal, Mexico. No. 3. Hetcerina vulnerata, 25. testes alacer, 53. 

 Hyponeura funcki, 101. Argia agrioides nahuana, 108. Enallagma civile, 109. 

 E. pnevarum, 123. Ischnura ramburi and 124. var. credula, 125. I. denticollis, 

 126. /. demorsa, 160. Erpetogomphus crotalinus, 171. Cordulegaster diadema, 

 175. Anax Junius, 179. ^shna multicolor, 204. Libelhda nodisticta, 221. Orthemis 

 ferruginea, 267. Tramea cophijsa, 280. Sympetrum illotum virgulum, 281. S. 

 corruptum, 286. Erythemis simplicicolHs collocata, 293. Pachydiplax longipennis. 



April, 179; May, 25, 109, 125, 175, 179, 221, 280, 281, 286, 293; June, 53, 

 108, 109, 123, 124, 125, 126, 160, 179, 280, 281, 286, 293; July, 25, 101, 109, 123, 

 124, 125, 204, 267, 280, 281, 286, 293; August, 281, 286, 293; September, 3, 25, 

 101, 108, 109, 125, 126, 179, 280, 281, 293; October, 3, 25, 109, 124, 125, 171, 

 280; November, 280; December, 281. 



CuERNAVACA, MoRELOS, MEXICO. 3. Hetcerina vulnerata, 4. H. americana, 

 24. Archilestes grandis, 25. testes alacer, 43. Paraphlebia hyalina, 52. Hyponeura 

 lugens, 53. H. funcki, 78. Argia oenea, 84. A. lacrymans, 85. A. tonto, 86. .4. 

 fissa, SS. A. tarascana, 92. .4. extranea, 93. A. vivida, 94. A. vivida plana, 103. 

 Hesperagrion heterodoxum, 107. Anisagrion lais, 119. Telebasis salva, 125. 

 Ischnura denticollis, 127. Anomcdagrion hastatum, 157. Erpetogomphus elaps, 

 159. E. cophias, 160. E. crotalinus, 162. E. sipedon, 171. Cordulegaster diadema, 

 178. /Eshna cornigera, 179. /E. multicolor, 181. /E. williamsoniana, 183. M. 

 luteipennis, 194. Oplonaeschna armata, 202. Lihellula sofurata, 203. L. s. crocei- 

 pennis. 206. Pseudoleon superbus, 221. Orthemis ferruginea, 239. Erythrodiplax 

 connata var. h' and 241. var. d' ; 251. Breichmorhoga tepeaca, 253. B. pertinax, 

 2QI. Paltothemis lineatipes, 272. Tramea onusta, 275. Perithemis domitia intensa, 

 280. Sympetrum illotum virgulum, 281. S. corruptum. 



January: Nos. 4, 24, 92, 93; Mav: 3, 4, 52, 78, 86 92 94, 107, 119, 202; June: 

 3, 24, 84, 92, 94, 103, 107, 159, 160, 178, 183, 202, 206, 221, 239, 261; July: 3, 

 24, 53, 92, 93, 127, 157, 159, 162, 181, 202, 203, 221, 253; August: 4, 24, 85, 88, 

 157; September: 3, 24, 103, 107, 119, 127, 160, 179, 275, 281; October: 3, 4, 

 24, 25, 84, 86, 88, 92, 93, 103, 107, 119, 127, 160, 171, 194, 202, 221, 239, 241, 251, 

 272, 280; November: 171. 



San Jose, Costa Rica. No. 2. Hetcerina cruentata, 24. Archilestes grandis, 

 67. Argia oculata, 86. A. fissa, 92. A. extranea, 104. Anisagrion allopterum and 

 105. var.? rubicundum, 113. Acanthagrion gracile, 157. Erpetogomphus elaps, 

 183. jEshna luteipennis, 203. Lihellula saturata croceipennis, 221. Orthemis 

 ferruginea, 237. Erythrodiplax connata var. e, 248. Brechmorhoga vivax, 254. 

 B. rapax^ 261. Paltothemis lineatipes, 273. Pantala flavescens, 280. Sympetrum 

 illotum virgulum. 



March: 203, 221, 248, 254, 273; May: 2, 67, 86, 92, 104, 105, 113, 157, 280; 

 July: 24, 104; August: 24, 92, 183, 203, 221, 237, 261; September: 2; October: 

 2, 248. 



From Table 10 and these three lists it is evident that the obser- 

 vations for different months in the same locality are quite unequal 



