42 ENTOMOLOGICAL SOCIETY 



zos and Senajii), in Alta Vera Paz, Guatemala, in April, 1906 

 (altitude between 800 and 900 feet), when we found a very 

 small phengodid larva or adult female, about one-fourth of an 

 inch long, bearing a ruby light in the head. This light seemed 

 to be thrown directly forward so that it was not easily seen 

 from above except when the head was raised or when the light 

 was reflected from some object in front. No other lights were 

 observed on our single specimen, but we only watched it for 

 a short time, during daytime, having no facilities for keeping 

 it alive with us, and no more examples were taken. No males 

 referable to this species were found at that place, but at the 

 coast, at Livingston, Guatemala, a few weeks later, a small 

 male Mastinocerus( ?), agreeing very closely with Gorham's 

 figure and description of Euryopa singularis and description 

 of E. hrunnea,^ was taken which gives the only clue to the 

 possible adult male obtainable. 



It was a pleasant surprise on our return to find that this 

 larva (or adult female) agrees very closely with Murray's 

 figures, and that there appears to be a chance of associating his 

 name Astraptor with a genus of these queer beetles. 



In 1868 Murray read a paper'' " On an undescribed light- 

 giving coleopterous larva (provisionally named Astraptor illu- 

 minator)" in which he discussed luminous larvae in general 

 and described, with figures (PI. I, figs. 1-7, copied herewith as 

 PI. I, figs. I, i""'^), the queer specimen found by Mr. Fry at Rio, 

 which had " Red light in the head, white light in the tail, and 

 one light on each side at each segment of the body. Light in 

 head permanent, the others showing by flashes." 



Our single specimen is much smaller than Mr. Murray's, 

 being only 6 millimeters long as against nearly 12 millimeters. 

 Its affinities with Mastinocerus are apparent, but the heavily 

 chitinized head and the reduced size of the maxillary palpi, 

 together with its more compact form, separate it as a fourth 

 type of larvae in the Phengodini, the other types being repre- 

 sented by Phengodes, Cenophengus, and Mastinocerus. 



The specimen is mounted in balsam, and the accompanying 

 photographs (PI. I, figs. 2, 2^) were made directly from it. 



The synonymy of Astraptor cannot now be given, but the 

 name must be used for a genus of the Phengodini closely re- 

 lated to Mastinocerus, and to which may belong Gorham's spe- 

 cies singnlaris and brunnea, which he placed in his manifestly 

 heterogeneous genus Euryopa ; and also two undescribed 

 species in the National Museum collection. 



* Biol. Centr.-Am., Coleoptera, Vol. ni, part 2, p. 109, pi. 6, fig. 4. 

 '' Journ. Linn. Soc. London, Vol. x, p. 74. 



