EiasTH Report of the State Eisttomologist. 157 



errors made by Mr. Walsh, in his description, noticed. Professor Riley 

 was probably acquainted with the O. pectinicornis larva at the time of 

 the above publication. 



The Larva of Chauliodes pectinicornis. 



Very little has been written of this insect. All the notices that I 

 have been able to find of it are cited in the bibliography on the pre- 

 ceding page The account given of it by Henry L. Moody in Psyche, 

 loc. cit., seems to embi'ace all of what has been published of it. Mr. 

 Moody found a larva on October 21st in a cavity in moist sand under a 

 stone, nearly ready for pupation. It changed to a pupa two days there- 

 after, and in twelve days more to the perfect stage. 



Of another example subsequently taken, and belieyed to have been 

 of the same species,- which it probably was, as G. rastricorni$ rarely 

 occurs in New England, Mi*. Moody has given the following particulars: 



Its movements in the water, other than by walking, ai*e always back- 

 ward, and are performed by a downward and forward sweep of the 

 tail. It could move rapidly, but at times would drift lazily about near 

 the surface of the water. It ate houseflies if they were held before it 

 by a foreceps so that they could be seized without first touching the 

 larva. 



" It was thirty-five mm. long, rather slender, narrowing moderately 

 from the middle of the body to the head, and more strongly in the 

 opposite direction to a narrow final segment. The head is large and 

 prominent, the body moderately flattened and somewhat appressed. 

 The mandibles are rather large and strong, nearly straight and strongly 

 toothed on the inner edge at the tip. The mandibles are usually widely 

 extended when the larva is walking at the bottom of the vessel. On 

 each side of each segment after the thoracic ones there is a slender 

 whitish filament, which is a little longer than the body is wide at its 

 widest part. From the posterior edge of the terminal segment there 

 arise two filaments, contiguous at their base, long, blackish, very con- 

 tractile and rather thicker than those of the sides. These filaments are 

 undoubtedly respiratory organs, and are usually directed upwards, so 

 that their tips reach the surface of the water. There is a long, stout 

 bifurcated proleg just beneath these filaments. The color of the head 

 is chestnut-brown; that of the body rather light brown, with a black, 

 interrupted medio-dorsal line, and on each side a much narrower and 

 more obscure similar line. The legs are rather stout, of moderate length 

 and honey yellow." 



Habits of Chauliodes. 



The brief pupal stage noted above by Mr. Moody of C. pecthiicorais 



(twelve days) is also a feature of 0. raatrleornis as observed by Mr. 



Weed —in one instance, foarteen days, and in another the very short 



period of eight days. Of this last-named species, the following habits 



