Coleopterous Fauna of Lower Rio Grande Valley. 59 
HALIPLIDAE. 
89. Haliplus , sp. — Attracted to light, June 10th. Two specimens of 
this genus taken by Wickham in July are doubtfully referred by him to 
H. ruficollis , DeG. 
90. Cnemidotus 12-punctatus , Say. — Taken by Wickham in July. 
Distr. Canada to Texas and Mexico. 
DYTISCIDAE. 
91. Laccophilus maculosus , Germ. — Taken by Wickham in sloughs in 
J uly. Distr. Eastern United States to Texas. 
92. Laccophilus americanus , Aube. — One specimen, from cistern, 
April 7th. Det. Wick. Distr. Alabama to Louisiana, Texas, Mexico, 
,and West Indies. 
93. Bidessus pullus , Lee. — Taken by Wickham in resacas in June and 
July. Distr. Mississippi and Louisiana to Texas and Mexico. 
94. Coptotomus interrogatus, Fabr. — Taken by Wickham in sloughs 
in July. Distr. Canada and Atlantic States to Texas and California. 
95. Copelatus chevrolatii, Aube. — Taken by Wickham in resacas in 
June and July. Distr. Lake Superior to Kansas, New Mexico, Texas, 
Arizona, California, and Lower California. 
96. Eretes sticticus , Linn. — One taken by Armstrong in September. 
Distr. Pennsylvania to Illinois, Kansas, New Mexico, Arizona, Texas, 
and Mexico. 
GYEINIDAE. 
98. Gyretes sinuatus, Lee. — In swarms on surface of Rio Grande, near 
edge in quiet places, at Fort Ringgold, May 13th. Distr. Illinois to 
Texas and Arizona. 
HYDROPHILIDAE. 
99. Hydrochus variolatus, Lee. — At light, June 20th. Wickham took 
this species commonly in resacas in June and July. Distr. Southern 
Texas and Mexico to Southern California. 
100. Ochthebius nitidus, Lee. — Taken commonly in resacas by Wick- 
ham in J une and July. Distr. Lake Superior to Texas, Mexico, Arizona, 
and Oregon. 
101. Hydrophilus triangularis , Say. — Taken by Armstrong in Sep- 
tember. Det. Wick. Distr. Atlantic to Pacific and Canada to Texas and 
Mexico. 
102. Tropisternus nimbatus, Say. — Taken by Wickham in sloughs in 
July. Distr. Canada to Georgia, Colorado, New Mexico, and Texas. 
